The goal is not to just make the money disappear, its to make it disappear in a manner which is interesting enough to make the characters want to go out and grab more.
I don't know about your group, but if some level 3 aristocrat walks up and tells the party that out of their combined wealth of 150k gold he deserves 145k because the king said so, my party A) is going to leave the room and quit the game for a time at least or B) refuse to have their characters adventure. Why should they risk their lives when some noble automatically gets a 95% cut for no reason? And donations to the church are dandy, and make sense, but not 45K in donation. Thats enough to start funding another church, if not completely finish it.