Optimal bet size for bonus hustling
Hello, just wanted to introduce myself quickly. I've been reading this board for a couple months, finally decided I have something worth posting. My background: 21 years old, live in the Midwest, and just need to get a little quicker with true count conversion and I'll have hi-lo down good enough to try it in a casino around here. In the mean time, though, I've been doing bonus hustling, and in the past month have made about $1500. After reading a couple weeks ago on here someone saying that they thought a $50 bet size may be best, I decided I really wanted to figure it out, since that didn't seem right to me. I have discovered what I believe to be the optimal betting for bonus hustling, and it is as follows.
I make use of a couple formulas from Blackjack Attack, 2e, namely:
Standard deviation for blackjack = 1.1 SQR(N) where N = number of hands played (page 18)
Trip ruin formula: ROR = N ((-B � ev)/sd) + e^((-2 x ev x B)/sd^2) x N ((-B + ev)/sd) where
N (x) = cumulative normal distribution function of (x)
B = bankroll
ev = expected value
sd = standard deviation
(page 162)
Basically, the idea I hit upon is that to make the highest hourly wage, you must bet large enough that you go through a casino quickly, yet small enough that standard deviation does not ruin you at too many casinos. To calculate the hourly rate for a particular bet size, the following variables must be defined:
D = Deposit
bo = bonus
ed = player�s basic strategy edge (typically a negative number, around �0.004)
W = total amount that must be wagered before a cashout
be = bet size
sp = betting speed, in hands per hour
Now, the variables in the trip ruin formula are calculated:
B = D + bo
ev = W x ed
sd = be x 1.1 SQR(W / be) = 1.1 SQR(W x be)
The risk of trip ruin is then calculated. From this, you can calculate the mean amount won per casino trip as:
win = (1 � ROR) x (bo + ev) � ROR x D
The time to complete a run is
time = ((be x sp)/W
For the hourly rate, divide by the number of hours to wager the required amount
hourly wage = win / time
Then, the formula should be tried with various bet sizes until the maximum hourly wage is found. The optimal bet will then be known. The formula can be applied at any time during the casino visit � say, after half the required wagers are completed and you are up $100, you might want to up your bet to be done quicker � just adjust bo by any wins or losses and adjust W to reflect how much more you actually do have to bet. I wish it were easier to explicitly find the optimal bet size, but as long as you have a TI-89 or similar calculator that can integrate or a computer program that can calculate the cumulative normal distribution formula, then it is not hard to plug in a bunch of values for the bet size until you find where the peak is.
As an example, I will do a typical situation - $100 deposit, $100 bonus, total must be wagered 10 times ($2000), with a BS expectation of �0.004, 240 hands an hour
Bet size Time (hours) Win Hourly wage ROR
2 4.17 90.93 21.82 .0056
4 2.08 82.49 39.60 .0495
6 1.39 71.25 51.30 .1081
8 1.04 60.63 58.20 .1634
10 0.83 51.3 61.56 .2120
12 0.69 43.23 62.25 .2540
14 0.60 36.23 60.86 .2905
�
30 0.28 2.14 7.69 .4680
32 0.26 -0.56 -2.16 .4821
As you can see, the optimal bet size is $12, and once you reach a $32 bet your hourly expectation is actually negative. Clearly, a bet over $12 does not make sense. What about a bet less than $12? Could that make sense?
Yes. The �win� column shows why. Compared to, say, $2 bets, you finish much quicker and that more than compensates for your increased risk of ruin. However, this only truly is the correct bet size if there are an unlimited number of casinos offering these bonuses so that you can keep up that hourly rate on average. In reality, there is a finite amount of money that can be made bonus hustling, and that is maximized by betting the minimum in all situations, regardless of how long it will take. Most people will choose to take a middle ground between the minimum bets and the optimal bet, and that is what I would recommend (I personally would do $4 bets when I am behind my deposit + bonus, $6 bets when ahead), unless you plan on doing this for a living, in which case I would suggest you find less tedious ways to earn $21.82 an hour � bearing in mind that that refers to playing time � cashing out time is unpaid.
Possible problems with the above analysis:
1.) I ignore double downs and splits when calculating how many hands must be played in calculating the standard deviation - might make the optimum bet actually slightly larger than what I've calculated.
2.) I ignore double downs and splits in calculating the amount of time to finish a casino - won't change optimum bet, just hourly wage.
3.) I ignore the time saved if you are ruined at a casino - might make optimum bet slightly larger.
4.) I ignore the fact that the EV at when you're not ruined will actually be higher, since the far negative fluctuations are not incorporated into the average. Negligible for small bet sizes, but will probably make the optimum bet larger still.
So, if anything I've underestimated the optimal bet, but I recommend betting slightly less than optimum anyway, so I don't consider it a big deal.
Please let me know what you think. I'm a college dropout and it's been years since I took statistics, but it seems okay to me.