Multipool is the biggest scam scheme implemented to scam the miners.You will always get less as compare to when your are mining on a single pool.
How is paying a fee for a pool to manage your hash power effectively a scam?
Sure you could micro-manage your rigs yourself and maximize your profits, but is your own time in doing that really worth less than the fee paid to multipools?
The fee is irrelevant, it's nothing.
The thing is they're not taking just the fee. read the first post. They get
much more by gaming the difficulty jumping coins, variable reward coins, and so on. Then they pay the miners just enough not to disappoint them.