GM Scrolls

10K is way too easy. Most people would have perfect equipment by the time they reach Lv 50.

Also, remember that the items are tradeable, after the effect is scrolled onto it, you can trade it away. There'd be no point unless you implement some kind of system where the scrolls make the item untradable when used. (much like the timeless items).

Or give everyone an untradeable one of a kind item, and make GM scrolls ONLY for said items. This would give a nice end-game weapon that is untradeable without unbalancing lower levels or screwing the market. Make the weapon difficult to obtain and bam, you're good to go.