In some airlines there is such posibility - once you finish your current contract with the agency- of being hired directly with them, usually on local terms.
Regarding how much the agency takes from your salary....you wonŽt know. Agencies are being paid by the airlines and they will pay you according with your contract.
How much is paying the airline to the agency for your service....is quite difficult to know since the agencies doesnŽt share this kind of information.
There is a tendency to forget that we pilots are not the clients but the airlines.
@TugaFly...for ASIANA IŽd go with Parc.