However, when I hear about (for example) people in the financial industry "extracting money from the market", which is a phrase some banks use when they are able to make trades that are certain to make a profit because they have faster/more direct access to stock trading, for example, they are adding no value, only raising the price for the purpose of taking money for themselves. Though they are not doing anything illegal, and I'm certainly not going to get myself in a wad about it, I personally feel it's a worthless and rather contemptable way to make money.
I outbid on buy orders and undercut on sell orders. I'm giving the guy that wants money now a better deal, and I'm bringing down prices on sell orders for buyers that need goods right this second. On top of that, I'm taking on the risk of not being able to move the product at a loss. If I'm successful, I get a small profit. Everyone wins.
I won't get into the RL middleman debate. Only the ingame stuff matters, and I think I've made my point.