Are not winning players - that is, they've never won consistently, such that they've never been in such a position to know!

For the most part, the casino cares about consistent winners on what they view as games of skill, such as blackjack. Win too much, too consistently, at BJ, and you might be shown the door. This has happened to me - I have been banned at BJ. However, this is a direct action - the casino would not in general bother to shut off the flow of comps to consistent BJ winner, but rather, simply shut off his action at the tables.

With games of what they view as chance though - such as Baccarat - the casino doesn't care how much the player wins or loses. They will keep comp'ing either based on the theoretical loss (for a winning player), or the actual loss (losing player). I've played Baccarat for years, and won at it consistently and never been shown the slightest impropriety. The casino always welcomes me back with open arms.