no confirm dialog on buying Stash tab ?

Not a bug, just a concern. I got my gold total up over 250,000 which is the price for the 4th tab in Shared Stash. Wondered if I should get it, didn't have anything else to do with the gold, didn't remember if I'd gotten an "are you sure?" confirmation dialog when I paid 50,000 for the 3rd tab, so I clicked to buy the 4th tab. Presto! Bought it, and 250,000 gold gone.

That's not "wrong" but consider this: when I train my Templar to use one skill or the other, a choice that can later be changed for very little gold (it's 500, I think, the first time), there's a confirmation dialog. It seems like an "are you sure?' would be a nice thing to have when spending a quarter-million in gold.