You know, I -was- about to call you a spammer earlier today, but only because of one line in your post:
Do you want to get paid just for having a Web site or posting messages on a message board?
Now, I don't have any ill feelings towards you, but as a fellow DP member, let me tell you that by suggesting someone do this, you're basically inviting him to become a spammer.
Advertising items on a website? Sure, that's fine. Advertising items on a public post? Heeeeeeeeell no. That could bring on a bunch of problems, including the poster that had the ad going on getting banned, and you getting yelled at for advertising that way.
We forum users tend to not like any sort of advertisements on our messageboards. Stuff like that can get you in trouble, so I can only suggest that you say that you do not recommend such a course of action so the poster doesn't get in trouble.