I wondered why Hhampuz
stopped managing both Bitvest and 777coin signature campaigns sometime back, and yet he's a very good manager especially when it comes to casino related campaigns, well, I can now clearly see why.
We cannot expect many to take this step and to risk losing their position in the campaign, especially if, as you mentioned, it represents a significant source of income for some of them. Due to their unique Tier-based system, many participants had to work for months, and some even for years, to earn their positions on the list.
But their pay per post ratio isn't even that good compared to so many active campaigns that pay out weekly right now. If I were in their position, it doesn't make sense having to wait for weeks, yet there are better campaigns. I would leave in a blink.