Probably we will soon see 4 more campaigns, even more than that.
I also expect that current active campaigns will assess results from early trial weeks, then make decisions to expand their campaigns with more slots or increase their payment rates.
Make sure, you are part of campaign, their business and also the forum. What you post, its quality, will contribute to the growth of this forum, and in a long run like some months, years, it decides the forum will become bigger or not.
Consequently, more campaigns will be launched here, and even with better payment rates.
My 2 cents.