Sponsors have to be more lenient about it. Remember no tour that I know of can actually offer a payout that players can live out of, so players have to have an amalgam of sponsors just to have a viable career in pool.
I kinda see both sides, if the players refused to wear the sponsors logos they would pull out and the prize fund would drop by maybe 20k. The problem only comes when they get sponsors that CLASH with rival sponsors the players already have. Then it might get messy.