Well, I guess it's exactly what the title says. Adding that one step would probably save many people, like myself, from accidentally buying 10 gold chests for a ton of diamonds.
Here is my response from another thread, we've asked for this since perblue was in charge and i guarantee we will never see it happen.
CS had been nice enough to refund me after I misclick one day. That would likely be a time sensitive ticket though.
I spent 250 diamonds today on an item I thought was being sold for gold......I wish the BLACK MARKET was diamonds and the PEDDLER was strictly gold.......