The inside story
Note: These are serious answers. Everyone else is pulling your leg.
1. Where do they prefer to sit?
Usually at tables with large well padded chairs (see next question for reason).
2. What is their spread?
Usually rather large, due to a diet of comped gourmet meals, hence the preference for large chairs mentioned above. Of course, if the question is directed at Aria Giovanni, it takes on an entirely different meaning.
3. How many are on the teams?
Enough, but not too many. It has been found to be ineffective when the team players outnumber the regular gamblers in a casino.
4. Are the doctors,lawyers,stockbrokers,etc...the big players on the teams?
No. They are all full time pros. However, they may be cleverly disguised to look like doctors, lawyers, etc., as well as construction workers, shoe salesmen and porn stars.
5. What is their usual bankroll?
Depends on what kind of a day they are having. Also on whether or not they have hooked up with Aria Giovanni earlier in the day.
6. What is the proper attire they prefer?
This is the easiest way to spot a counter. Look for loud bermuda shorts, t-shirts that say something like "I lost my (picture of donkey) in Las Vegas" and fanny packs.
7. How long do they stay at the table?
Until they pass out from exhaustion, or the casino runs out of chips, whichever comes first.
8. Are there any tricks they use,if so,explain?
The ability to make oneself invisible has proven to be quite useful.
9. Which casinos do they prefer?
Counters seek out casinos that offer single deck games in which the dealer stands on soft 17, early surrender, doubling on any two cards, and doubling after splitting are allowed, and the dealer deals until only a few cards are left in the deck before shuffling. You will usually find a lot of counters at casinos with these conditions.
I hope you appreciate this, as I will probably get flamed by my fellow counters for giving away all our secrets. I am trusting you to keep this info to yourself and not to reveal it to casino personnel.