First there is a minimum of $1500 required to open a new business money market account with EverBank.
Second there can be a monthy fee of $14.95 assed if the average balance during the month is less than $5000. This could potentially negate any interest gained. For example the current money market rates for balances less than $10,000 is only 1.01% APR, 1.02% APY so the monthly interest earned on 5000 dollars at this rate would only be about $4.25 netting a $10.70 loss per month.
Third there is a limit of 6 transfers and/or withdrawals per month, and only 3 can be checks.

Here are a couple of their business money market account rates:

• $100,000 – $249,999 account balance: 1.40% APR, 1.41% APY
• $50,000 – $99,999 account balance: 1.15% APR, 1.16% APY