Yes, they are above the regular contract. But the problem is that to add a new contract you need to wait till you made 10 times more money in the ES than in the MES. The MES will be able faster to add a new contract. By the time the ES can add 1 contract, the MES will already be at 24 contracts. So 20% bigger trading size for the MES.
The growth of your account is the result of frequency* amount of profit*size of the contract.
Just make a simulation yourself in excel. Compare $5000 in ES with margin $5000 and $5000 in MES with margin $500. So you trade the same amount but with 10 times more contracts (and 10 times more expenses) in the MES. In the 3 points simulation you will see that the account of MES will be bigger (after the 10th trade) than the account in ES till around the 300th trade. The advantage of the MES trades will be around 14K more net profits. Only after the 300th trade ES will be more profitable.