Because some1 at one time or another belonged to those guilds and got them and then quit and sold them etc etc.
I have a friend zeko and siredita (happy couple nice people) the girl (zeko) had 4 rulers even tho not in any big guild ever. People just quit put their wts thread on the forums or whatever and **** gets purchased by the highest bidder.
been around for such a long time ive seen it happen. Some ppl frown on it oh they should give to their guildies but nahhhhhhhhhhhh **** that you earned that rulah :P