I think there should be a /buy command like you type: /buy (item) (# of how many you want) But it is the reg prices. And if you don't have enough it will say like what it says with a trade sign.
That would defeat the purpose of spawn shops and shops in general, it would mean diamonds are always worth $25, when in shops, theyre $30-50, and every other expensive block would be worth nothing
-1 on that, because that would change the prices and everything. The flow of money would strongly plateau. The interaction with other people would most stop and like tdogg120 said the stores on this server would be pointless. I personally like the supply and demand, and not the unlimited supply of stuff that you can buy at any moment.
This has also been suggested before and got denied therefore this will very likely be denied as well.