Like a poker table you would think they might throw you a "coin", even if it is just for future good luck.
Virtually all the early block solvers on this pool were very generous and did donate after solving a block, but lately that practice seems to have died off. Presumably they're high stakes people if they're renting (owning?) petahashes whereas the early solvers almost all had a lucky strike with lesser hashrate. Oh well, it's not like they're obliged to.
