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?
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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.