I have no big problem with spammers. I can easily spot them. The community can also easily spot them. Just add a spam rate in the messages, then give to the reader the freedom to select his moderators.
What I dont like is paid advertisers and journalists. They lie, and you cannot spot them easily. Dash used this techinque in early days and they may keep using it. I remember they were offering me 0.1 dash in order to mention Dash coin in other forums (not only positive comments were allowed, but also negatives! ). Of course I refused to work for it (that's why I have only 1.5 dash now), but others did not refuse (and they are rich now, but their soul is a little bit closer to hell).
So if you used this techique as community, dont blame others who do the same.