I'm not trying to be a dick here or start an argument but honestly you can't really try to exert control over a free market or bitch about it....it is what it is.

Undercutting does piss you off when someone does it to you and indeed it does hurt everybody involved, but we're all gonna do it at one time or another. When you see a bunch of crap for sale and you want GP badly what does common sense tell you to do? Sell it cheaper. This price "crash" is usually just temporary until the supply subsides thus if you had been patient you would have made money money. Hell, I saw plat subs for like 1.1m a month or two ago....if they were at 1.8m obviously the 1.1m "crash" had rebounded.

Sometimes the price does permanently crash, but it's rare. You also have to take into consideration the fact that GP is constantly becoming more valuable due to more and more goldsinks. The price of literally everything has dropped significantly in the past 6-12 months.