Some users are not interested in the merit system and they may ignore the OP, quality poster, and important information from send of merit. They didn't care about anything to do with merit until one day they realized that regardless of the number of post, activity, merit were a condition for rank up. Regarding spam behavior, it can't be avoided here. However, we can still do the eradication effort only by reporting a number of badly quality post to moderator.
The uses who do not care about the merits here are the one who do not come here often. They could be anyone who come here to get some knowledge or others who only use bitcointalk to advertise their services.
On the other hand, if there is anyone who do not care about about merits and keep on posting and one day see that merit is the requirement to rank up, then he is an ignorant person probably a shit poster who do not care to read the forum rules.