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?
Multipools deliver a service as advertised. It's not a scam.