That's how you would put in an offer for 500 at that price. Now you'd have to wait for someone to sell to you, and hope people don't leap-frog your price. Either stop trolling or go trade for 5 minutes to learn a thing or two about how the exchanges work.

Buying 500 right now off bittrex would land your average cost above 0.003 per, which means his deal is clearly better if you wanted to buy 500 right now, without waiting/hoping for orders to fill. If you don't want to actually run the numbers, just look at the "SUM (BTC)" column on the sell side, and look how deep you'd be buying on price with 1.5 BTC depth. Nearly half of the 500 would come from 0.005 prices.