If you've played WoW, you know what I mean. You save up your poetics/law/whatever, buy a piece, and have 2 hours to return to item and get a full refund. I know there's a confirmation dialogue for buying stuff, but this isn't really about mistake purchases, just about realizing the piece you bought wasn't the best upgrade and you'd like to go for another one.

Of all the other systems FF14 stole from WoW, why not this one?