<heh> Over in the
Ars Magica rpg community, the same debate comes up regularly.
There are plenty of ways that one
could get wealthy relatively quickly (in either game-universe). In the Dresdenverse, the key catch (it seems to me) is that
the Universe itself is a moral place. You get Lawbreaker Stunts even if the WCouncil has no idea you've done anything wrong. And if you want to get rich via magic... well, you have to
really believe. You have to take one of the fundamental creative forces of the universe, and use it for something as banal and petty as getting wealthy... and
really believe that this is the
right thing to do.
That's... pretty pathetic, morally speaking.
The older you get (in general, I know there are exceptions) the more conservative you get. The Council is grotesquely rich because they have invested -- conservatively, but consistently -- for a very VERY
VERY LONG TIME. The only reason they don't own the whole world is that they aren't the only investors with the same sort of continuity & track record. Given Salic Law and standard mortal inheritance, I'm sure that there are "wizarding families" (to use something from the Other Harry) who are also quite wealthy, albeit not on WCouncil scope.
Given how long-lived wizards tend to be, I expect that mundane methods of building wealth -- conservative, long-range investment strategies -- probably suffice, even for individuals who aren't inheriting from generations of wizards before them...
However, if a player wants to GetRichQuick(tm), remind them that it's easy: just spend their advancement points on Resources, maybe grabbing a Resources Stunt to enhance matters. If they do *NOT* buy the Resources, then you're afraid -- as GM -- that Something Will Happen to their GRQ scheme, and "somehow" they won't have the benefits that high Resources gives them. If they want stories that lead to improved Resources, go for it! Possibly even handing out the Resources *AS* the reward, not as points for them to spend on Resources.