Whats to stop them from simply solo mining ... they are a bot net ... they should have power enough to match most mining pools ?
It's a lot more work?
1. They're likely to be CPU mining, so probably don't have the power of even the smallest mining pool
2. It's more tracable since it will be going back to 1 bitcoind daemon
3. If you're likely to be taken offline at any point it's better to get small regular payouts than possibly one large one, but probably nothing.