I use the Xbux sort of. If you're new and show up a lot with good work, which pays money, it tells me you're serious and I assess whether or not you're ready for a title match. If you've been around a while and don't show up a lot, you may have money, but I'm not seriously looking at you for a title. I also determine, based on records and interest where I think you belong in terms of titles. Then, after I figure it out, I put you in a contenders match. I can't speak for everyone when doing this, though.