Because they're different people, driven by different motivations and with different personal boundaries? Veronica is clearly willing to get fucked for a chance at saving her dream, but she isn't willing to get fucked for a chance at a maybe a possible advantage, because her dream is worth a lot, but not everything. (...) Fel just likes to get fucked, preferably in the ass. Different folks, different strokes.
There's one aspect missing in this summary -- Veronica, quite like Felicia, likes to fuck people she is attracted to. From her own words we know she's been doing it frequently, and we can see it from how readily she'll jump any girl you bring in her vicinity.
So, an argument was made here that "oh Veronica likes Edwin enough, she just doesn't fuck him because he is part of the club" . And that's basically a nonsense, because if Veronica was indeed attracted to Edwin to the point of wanting to fuck him, him being part of the club shouldn't be an obstacle in this -- as fucking a member of the club would only bring her extra advantage,
on top of all the fun from having sex with someone attractive to her.
So really, the argument that "Veronica won't fuck someone from the club for just an advantage in competition" in a round-about way acknowledges that said advantage would be the
only thing Veronica would get out this deal (and that's not enough to make her want to do it). In other words, that the attraction and fun from having sex with someone she finds attractive... simply isn't there.
you THINK you can make the girl of your choice win, there is no definite proof that you accomplished anything that kathy didn't want you to.
I guess we will know soon enough, considering with the next exhibition you can potentially get a girl of choice her 3rd win, which should be enough to declare her an (early) winner.
But even if Kat somehow stretches the competition for another round, it doesn't change the fact that she'd find it quite difficult to explain why a girl who won exhibitions 3-4 times shouldn't be declared the winner of the competition, when that's what she herself declared would determine the winner. Especially when the player can do this without any in-game deal, but just handing the wins to a Carnation who isn't Rose (or to Rose, but after officially turning her down and with no deal in place)
"Edwin has rigged the competition by fucking this girl vigorously but being lenient towards another one!" would be pretty ridiculous claim to make from the stage. Even though, in reality and under the hood of the game, this is exactly how it works.