We all like click bate titles, otherwise we wouldn't click on them.

I find the fact that people omit the casual title an interesting detail. However, I'm not sure I agree with your reasoning on why you don't see it so often. Two points to consider.

My Danganronpa RP was posted in the casual section and has the casual tag. I'm surprised that my RP was not sampled in the 2500 that you did. I posted in it recently, so it should have been in the first 100 or so pages. I will say that it's become very collab heavy, and the last post was made 24ish days ago, but I still think it should have been in the first 100 pages. The last OOC post was 4 days ago. Furthermore, I've randomly clicked on 5 RPs and all of them had the casual tag. There might be something wrong with your software. 

RP in question: https://www.roleplayerguild.com/topics/157933-danganronpa-tower-of-carnage/ic

Secondly, there are a limited number of tags one can put on an RP. So if an RP is already in the casual section, scrapping the casual tag could have been done to make room for something more relevant. 

NOW!

The stats on the rate in which RPs are created is an interesting one. Personally, I've been quite successful with my RP ventures as a GM and seldom look for something to join. I believe this trend is a combination of things. Firstly, I think everyone tries to start their own RP at first, and then most of those people decide it's too much work to promote an RP and join one instead. Interest Checks have gotten a lot more ambitious, and it's much harder to stand out without putting forth considerable effort. So while it may have to do with player density, it could also have to do with the ever changing RP meta. My danganronpa RP has been going for 4 years, and that's largely in part because it had a very strong start. I started months before Danganronpa V3 came to the west, and I was rewarded with a bounty of players stoked with interest. Had I started it today I do not believe many people would have bothered to join.

Good stuff, [@FinalPalladium]. C :