It wouldn't go over well with... whom, exactly? Keep things looking fair for, again, whom? A random nobody who's upset over her own lack of forethought or a presumption that turned out wrong? Why would you spend money just to appease her in such case, when you can simply threaten her instead that if she doesn't keep her trap shut and any of this gets out to anyone, her current debt is going to be the least of her problems? These people are criminals who don't shy away from violence and outright murder, and who get the law on their side, to boot. You don't really think any of the girls would risk their very lives just because they'd want to vent about their bad experience?
Not to mention the very nature of such venting -- "So imagine this, i took part in a month-long Eyes Wide Shut sort of fucked up sex show for old farts, and in the end didn't get paid for it!". Yeah, definitely something you want to share with your hairdresser or other mothers in your girl's class, or friends, if you even have friends.
Keep in mind any potential Carnations didn't even know the club existed in the first place, and they're in one way or another lured in by the patrons. It's not like any new candidate a year down the road is going to go, "wait no, i saw on TikTok that this particular secret club for perverts can't be trusted to pay out" when presented with opportunity out of the blue.