I don't understand this concept of cover plays. I don't use them, no one at the BJ bash I met use them, and I fail to see the reasoning behind using money and losing money as a way to convince the casino you're not a threat. First off, I hate the SD that comes with playing BJ. Why not use that cover? Leave at a negative session and make it clear to the PC that they got you(this time) Kick and scream, and ask for a dinner comp. But when you win, win quietly. Nobody likes a sore winner, and this case, it holds particularly true.
See how peeps on this thread talk about Gamblers over APs? Especially famous gamblers, and yet they're still allowed to play? Act like a gambler, and they'll welcome you with an open invitation. Act like an AP, and you'll only get an open invitation to an ass kicking. Read "burning the tables in Vegas" by Ian Anderson if you want to know more about how more effective it is to carry yourself as the average gambler instead of all these pointless ideas of cover plays, playing -EV games, etc.