Just like in the content of OP, I am a stake participant and I do receive my pay in my stake account but never have i used it to gamble. The thing is, I am more of a sports bettor and I'm comfortable betting in local sportsbook using fiat.
At the same time, gambling with your signature pay might force you to go against your bankroll management. Which is one mistake I wouldn't want to do.
I think this is based on individuals, some perons can actually be moved to gamble when the received their pay from signature campaigns that pays directly in the account if their participants in their site, I remaber when I was a participant of Jacks club is signature campaign, we were been paid in the casino site but I have never used any of the funds paid to me to gamble, through out my participation in that campaign, so I will only say this depends on the participants and how he or she does their own thing, one thing i know for sure is that, once any gambler starts gambling with amount paid to them directly in their casino account, the participant may not be able to withdraw a dime even when he or she wins, infact such gambler might decide to leave he's paying in that site so that he will using it play there.