Originally Posted by yougi
Mechanically, it is exactly the same: instead of selling their +1 sword to buy a +2 sword, they pay in [insert currency] to improve it, and instead of it being in town, they actually are in [whatever place you need to be at for the ritual].
[PC raises sword to Druid circle in front of the biggest tree of the forest]
PC: "O wisest elder shamans, perform the Ritual of the Flaming Blade, infuse my weapon with the power of fire, to vanquish Baron Von Evil and his minions!"
Druid: [wryly examines sword] "Seven grand. Take it or leave it"
PC: "But... I have no-"
Druid: "You some kinda retarded? Listen, kid, we got bills to pay, and we 'aint exactly running a charity here. Cough up the dough, or get out, 'fore I have Smokey here pull yer head off" [motions with head toward a rather fierce-looking Dire Bear]