Well, this has always been my position as well. But I have read about some AP's that play some online casino games as a means of playing through the rollover amount. Axelwolf is one such player. He has specifically mentioned playing some blackjack. And blackjack would be a great way to work through the rollover if 1) the game was honest and 2) play counted as full amount toward the rollover. But most places blackjack play counts .05 or .10 on the dollar, making it a bad choice even if the game was honest.
And I did my own test last year to see if I thought the blackjack game was honest with mixed results. It seemed like everything was fine if you were betting $2, $3, $5 dollars. But as soon as you bet more than $10 at say $15 or $20, results felt very unusual. Small sample size, so I didn't want to make too big a deal about it, but an experienced blackjack player can just feel when something doesn't feel right. It just felt like too many dealer blackjack and pulling 21 on the bigger bet hands. Nothing scientific, just didn't feel right, so I abandoned any thought of playing blackjack as a means of working through the rollover.
The surprise email yesterday offering 10 times the usual amount toward rollover, made me want to give it another shot. Overall results were not unexpected, but the 16 losses in a row did surprise me. I didn't think they would be so blatant about it. Lesson learned, or maybe confirmed....again.