Suggestion: add a tab where you can browse other people's limit orders. Because right now, you might place a large and daring limit order on a low-activity market, but nobody sees it. Since most markets have low subsidies, there isn't much for whales to trade on. If they can browse through other whales' limit orders, there would be much more opportunity for big trading. You could rank the page results by order volume and popularity (i.e. how many people are trading against the order).