A shot in the dark at the chances
6 deck shoe, probability of getting two aces to split: .00568
1 deck, probability of getting two aces to split: .00439
This data is taken from Wong's Professional Blackjack which is a simulation involving penetration and two hands being played against the dealer, if there is a shuffle after every round then the frequency can be determined by the following formulas --
6 deck: ((24/312) * (23/311)) * .97796 ;
for 1 deck: ((4/52) * (3/51)) * .98694
(The .97796 and .98694 parts account for the rare you have two aces and the dealer turns over a blackjack.)
After splitting, getting a Ten on that second Ace is:
6 decks: (96/310) = .30968
1 deck: (16/50) = .32
So you get the extra half bet bonus:
6 decks: .00568 * .30968 = .00176 hands
1 deck: .00439 * .32 = .0014 hands
So assuming the standard 100 hands per hour, $25 betting unit, this earns you $0.000175 cents per hour, in the most favorable 1 deck situation.
Try not to spend it all in one place.
I suspect the code on the second hand is falling thru to "pay ace and face 3:2" routine, not having a flag that a split had occcured.
YAHOO games blackjack pays split 10s and split aces 3:2 when you get a "non-natural" natural. You can also do infinite splits and resplit aces and hit split aces multiple times and double down on any number of cards even after splits.
Despite all this, the average YAHOO player is a real yahoo and manages to lose consistently. In fact some players claim the YAHOO game is rigged, although there would be no point to it since the YAHOO game is just for fun, there is no profit motive to cheat.
I suspect your on-line game has the same experience with people losing. Why do you think they can afford to pay you that sign-up bonus I assume you are getting?