1. not solo mine, AMHash will also mine in BTCguild, Ghash or other pools;
2.mining in which pool will not affect investors' profit, AMHash will pay them on theory calculation.
Spread hashrate sounds like good idea to minimize bad luck (and decentralize bitcoin network) but it still will be existent. Do you plan to have some buffer in case that income < calculated payout?
Mentioned pools have merged altcoin mining enabled. What will happen with that altcoins?