This is a slight variant on the previous topic about obvious advertising.
Let's say there's someone who enters 7 answers within a few hours of sign-up, and hasn't returned since. Half of those answers point at for-pay software which he doesn't personally develop, but is sold at 30% commission by a marketplace site which employs him as a blogger, on the topic of marketing(...)
Despite not actually producing the software there's still a vested, if indirect, interest here that calls for disclosure, right? I'm not calling spam(yet; it's only been a week), but it definitely looks a bit like Astroturf to me.