For 9-6 Jacks or Better you will win $1200 or more with every four of a kind or higher. The return for a full house and less is 0.911103. You'll have to churn though your original bankroll 1/(1-0.911103) = 11.249016 times until your cash has either been converted to check or lost to the house edge. The house edge is 0.004561. Thus, you can expect to lose 0.004561
× 11.249016 = 0.051306 times your original bankroll.
Interestingly, the cost to convert cash to checks is less in 9-6 Double Double Bonus, despite the higher house edge. That game has higher wins for all four of a kinds, so your checks are larger. In that game, the return from a full house and less is 0.777138. That means, you'll have to cycle through your bankroll 1/(1-0.777138) = 4.487076 times to convert it to check. The house edge in 9-6 double double bonus is 0.010192. Thus, the expected loss converting to cash is 4.487076 × 0.010192 = 0.045733.
You could cut down the cost even more with strategy deviations that target four of a kinds and higher, but I'll leave that as an exercise for the reader.
This question is asked and discussed in my forum at Wizard of Vegas.