i see a lot of users suggested that you buy a high level account and start with a signature campaign.
while this is a good idea, you can not earn $500 a week with signature campaigns.
look at the rates here for yourself:
https://bitcointalk.org/index.php?topic=615953.0$500 a week is nearly 2
BTC !!
I think you could, if you went to one without maximum post limited and posted literally shitloads daily. You would end up either insane from too much posting or banned since you would flood every board.
it would be possible only if you was the only one carrying a signature, but seeing how literally anyone has it already, you can't post that much
because you would have more room to post, but it is not the case right now