99% may be a bit of a stretch, but you're on the right tracks. Sometimes the reason for leaving a guild is not as close to the surface as one might imagine, and the same goes for a player joining a new guild. For the most part, though, you're on point.

Come to think of it, I think loads of every present day guilds have some sort of that going on somewhere. It doesn't necessarily taint the guild or the player, but it is undoubtedly negative and sadly exists.

Maybe not more than anyone ever depending on who's opinion you ask, but that truly is an admirable reference.