BiggusGeekus
That's Latin for "cool"
Yeah, but the caster is getting to pull off a highly specific and tailored event.
It is the same kind of decision casters make through their entire high-level career. Do you really want +5 INT? OK, it'll just cost you exp on five wishes. Do you really want a +6 stat enhancing item? OK, it'll just cost you exp (and gold) to make a magic item.
Other classes have to quest for specific items or trust their luck. Casters have a degree of control over their fate (as they should) but at a cost (as it should be).
It is the same kind of decision casters make through their entire high-level career. Do you really want +5 INT? OK, it'll just cost you exp on five wishes. Do you really want a +6 stat enhancing item? OK, it'll just cost you exp (and gold) to make a magic item.
Other classes have to quest for specific items or trust their luck. Casters have a degree of control over their fate (as they should) but at a cost (as it should be).