If you want to become an escrow because you heard it is easy money and very profitable job - it is not exactly true.
It can be a pain in the ass to be an escrow, especially at first when your position and reputation is non existent.
You will have to do escrowing completely for free and hope that your clients will tip you - that is the main source of money for escrow.
Only the most reputable escrows can ask for ~1% of transaction escrowed.