If you want to actually make money as a Merc/Hunter your best best is to join one of the existing groups. That way you don't have to go through the whole ordeal of getting on all the boards that stack yourself. Stacking bounties is the key.
Unless I"m mistaken, Silver has claimed close to 2 or 2.5 bil in bounties. Getting that much from hunting is not what anyone will typically get. Thats a combination of lots of luck and being handy with a SNAC. I haven't done any calculations in quite a while but I'd say I'm in the 400-500 mil range since I joined the Reavers. One thing to remember, though, is that you won't make trader or miner levels of money but you can definitely make plenty to get by on.