»[Survival] Confirmation question on Chest-Shops

Recently I fell in the following fail situation:

I was walking near kewl's shop at spawn when i decided to take a look inside. While passing in front of the Slime Spawner I started eating a steak as often accustomed to do. But this time it fell heavier than usual in my stomach, since I pressed by mistake left click on the slime chest-shop. Spending without reason and cause 580k.

So I thought to propose, if and where possible, to add some kind of confirmation question, where we buy our stuff. If not in all chest-shops, at least to them with a high prices.. lets just say to those with 100k and more.