Well, actually, I'm fairly sure that those kinds of tactics are illegal in our own economy, which is one of the most free on the planet. Not buying a simple commodity and selling it for a higher price, of course, but aggressively "cornering" the market on something in every possible venue. We only really have one market ... the Auction House ... and this fellow's actions are much more akin to gorging yourself on stock holdings (to intentionally bloat the value), than they are like buying out a single supplier to sell at a markup.
At the very least, I think that gobbling up every possible source of a product should be discouraged as unethical in any formal business training you could receive. There's healthy competition, and then there's ruthless elimination of competition.