Nobody says you have to write a thesis with every post and there's nothing wrong with one line posts and even the occasional one word posts but when someone's entire post history consists of one word posts in off topic or at best a short half-assed sentence they're a spammer in my and many others eyes. A good poster will have a mix of all sorts of posts from long to short and you can easily tell the difference between a lazy/greedy spammer who is only bothering for payment and a decent poster. Check out shorena's posts as an example of a quality contributor: https://bitcointalksearch.org/user/shorena-181801. He might make the occasional one or few word posts but the majority of his posts are helpful and it's clear he puts a lot of effort in and isn't just churning out as many crappy posts as he can. The vast majority of people on this campaign either post entirely in Games and Rounds or at best squeeze a short sentence that they put the minimal amount of effort in and it's not hard to spot.
I agree one hundred percent. It is VERY easy to determine the abusers from those who post with honest intent. I just think that the rules need to be laid out clearly and enforced regularly....that's where the problem seems to be: the rules aren't being enforced.