CMKM Diamonds Inc. (fka CMKX)

[andrius]

you are right some brokers that offer free trades do screw you by only executing your trades when they have off setting trades to make $ in the spread. You'll never be able to buy bid or sell ask.

But not all. Some brokers that do banking and lending will give you descent fills and good platform to trade on if you keep high balances. They make their profits using your $. With fractional banking a 500k balance could be good for 5M worth of mortgages which is a lot more money than 10-20 trades an average investor might make a year.