I get about 200 dollars per a campaign as a Member. And the bounties are generally for 2 months. Compared to what is written at the topic, it is very very small. I don't know in which bounties you take place, but I never saw one which gives so much.
It depends on how much you have been rewarded and how much the coin is in the market. Some altcoins give high profit if you find a very good project that become success and many investor want to have the coin to buy. I joined two consecutive campaign and received a reward but only for the second one I've got my earning. The first didn't success but the gave a reward but there is little amount who recognizes the coin which the reason why it has low price in the market.