Quote from FR supplement Lords of Darkness on the Twisted Rune (pg. 177) "The Rune has even been known to hire good adventurers to further their plans, never revealing the ultimate source of their funds." This leads to an interesting scenario where a good man fights for an evil cause, finds out it is evil, and then seeks revenge for having been used once he discovers that the cause he has been fighting for is in fact not good but evil.