The only issue with adding a purchasable reforge option is that it allows the rich to simply re-purpose their loom stash every time they respec, while it doesn't allow the peasants* to acquire looms. It'd kinda be better to just have a fixed price for lps on the market, and maybe each account can only buy 1 per week or something.
*Obviously we aren't getting too many new players nowadays, but there are at least some noobies out there who have less than 1000 MWs.