Hardly. The difference between someone who is only spamming to be paid, and someone who is posting out of genuine interest, is blatantly obvious for anyone to see.

I just went and opened the last page on the first thread I found on Altcoin Discussion. Below are a selection of posters from that single page on that one thread. Are you honestly telling me that you think these are all valuable and meaningful contributors to the forum, or that they would be spamming in the way they are if they weren't being paid for it? I would argue the exact opposite - not only are they not contributing, they are in fact hampering and hindering meaningful discussion with their nonsense spamming.
https://bitcointalk.org/index.php?action=profile;u=900662
https://bitcointalk.org/index.php?action=profile;u=173907
https://bitcointalk.org/index.php?action=profile;u=1148217
https://bitcointalk.org/index.php?action=profile;u=938950
https://bitcointalk.org/index.php?action=profile;u=1244118
https://bitcointalk.org/index.php?action=profile;u=924029
https://bitcointalk.org/index.php?action=profile;u=2132644
https://bitcointalk.org/index.php?action=profile;u=370057
https://bitcointalk.org/index.php?action=profile;u=1971577