I've been curious as to the same. I keep waiting for more banded (non set-piece) tournaments to come up, and my games have dwindled down to the 20s. Based on the comments of others, banded tournaments seem to be preferred by most of the RHP community - high and low ranked members.
Maybe it's a resources issue, and there are so many tournaments ongoing it's putting a strain on things - which is understandable.
I'd also like to know if there's any rhyme or reason to the scheduling of tournaments. For example, if I knew that the third Monday of each month is when the banded mini threesome tournament is posted, I'd be sure to check in to join.