BATS managed to capture over 10% of the trading volume on NASDAQ-listed securities in January, so now they are trying to muscle in on the trade in NYSE and regional listings. Today, BATS traded 9 million shares of NYSE-listed securities. It's not much, but they have to start somewhere.
Also, on a stock I was trading today, I saw BATS getting hit before limit orders on other ECNs posted earlier, so to say that you can only get hit on a level break is a lie.