A while ago, I was actually thinking about joining their campaign as some sort of experiment, back when they still paid a maximum of 0.1 BTC per week (if I remember correctly).
Just to see if I could actually manage to make those 1000 posts required to get the max amount. Not sure if it was a 1000 exactly, but that's the number I vaguely remember.
Not by shitposting my way to 1000 mind you.

But yeah, I'd have some real trouble getting to those numbers, even if I treated this as a full-time job for a week.

The 25-posts-per-week campaigns are much better in that regard. If you're going to allow campaigns, I think that should really be the preferred formula.
Gotta admit that I'm also quite annoyed at seeing so many low-quality Stake posters all over the forum.