I'm not sure what you're talking about re: guilds and spell levels. In earlier editions, spell levels indicated (roughly) the power of the spell, and hence what level you needed to be in order to cast the spell. In this regard, 4e is just like every other edition, except that the spell level numbering system is no longer separate from class levels, as others have noted. They didn't have anything to with guilds, social advancement, or anything like that. Perhaps in your campaigns, the level mechanic was tied into the story in this way, but it wasn't part of the rules (as far as I can recall).