The rewards lies elsewhere
I imagine this has been answered many times, but are there any online casinos that have a good, fair (beatable) Blackjack game? I have a hard time trusting their programming, especially when they are out of reach on some Carribean island.
There are good sites out there which offer fair blackjack (at least within reason, ie a % or two, since an unobtainable number of trials would be needed for statistical confirmation of absolute fairness). Most shuffle after every hand. Global Player and Crockfords offer multiple deck games with shallow penetration. Ordinarily these games woud suck but there are certain advantages of counting online which partially compensate...Cryptologic casinos offer an 8-deck game with a 2 deck cut-that is such a poor game though that nothing really compensates for it. I think OddsON's blackjack.com has some countable games but I can't verify their fairness personally.
Also Boss Media offer a single-deck game. Its shuffle-up after every hand but has a small edge off the top.
I have a hard time trusting their programming, especially when they are out of reach on some Carribean island.
Cheating is much less of a problem online than simple non-payment. None of the countable casinos will stiff you and I have heard no confirmed reports of abnormal results beyond the usual "I last five hands in a row the software is rigged" stuff.
Many of the online casinos are regulated in Britain or Australia, where they have much higher standards of regulation than in Nevada.
Do you use card-counting against any of them with success?
The only real reason for an advantage player to count cards online, is that they have a card counting fixation or they are qualifying for a bonus. In the latter case counting adds little to your EV but can help with the flux, though fewer casinos allow blackjack for qualification every day.
I did try and attack Global Player's 2-deck game with 40% penetration testing it for small stakes with a $1-$12 spread. I was really convinced they couldn't offer a game like that which was honest because you could shuffle up at will by leaving the game, so you never had to play negative counts. Over a couple of days I'd managed to lose $160, though that was not a statistically significant result. I got distracted by other opportunities and I think the game got pulled afterwards.
The real money online is elsewhere...on Friday for example I played a roulette promotion where my expected value was about $40,000 for two hours play, or 80% of my initial bankroll. I'd have passed up a single-deck game dealt to the last card with ES for that. I think you'd be missing the point to focus on card counting.