Yes, there are many in the gambling section, most of them Stake, as the OP said. Another example would be junder,
which I've been talking about recently. You can see that making the written rubbish too long can earn them a bonus and that's why you see so many in that campaign writing long posts that at first glance look coherent but without basically saying anything meaningful.
Write whatever you want in your style and stop crucifying people for writing so much. I don't even know the sensible reason for this topic only for the fun of it as some might write a few lines as possible and still make no sense, while some might write much and all making sense, and vice versa. So it is unfair to say that those who are writing much are all writing rubbish. You can only treat cases individually. In case you don't know, the topics and replies that are much could carry a lot of semantic load and I know that this is not only good for the writers' improvement but also for the campaign the writer campaigns for.
Some of you do not care about the campaigns that pay you but for the money, while others care about the two and deliver as they should, even more. What I wouldn't be happy about is writing long lines with no meaning, that is so bad and such errors must be corrected. But if the wording is good and coherent, then let it be. As for "junder", I haven't read his posts but it is not a must that you earn merit on the forum before you are considered good and only an unwise/partial person wouldn't know that the merit system is not perfect. The guy, as I check now, writes mostly on the gambling section that fetches almost no merits, so what do you expect?
Mind you, it is not all quality posts that will attract merits, most are unappreciated. So leave people to how they naturally can write but correct them or point their attention to where you feel they are doing things wrongly and stop being perfect.