As both a convention GM and a creator, I think that data would have at least some value. You don't even necessarily to follow the data, but having it helps.
It's like designing for Shadowdark: having design data is nice, but in the end, does it matter?
We very much enjoy playing Daggerheart in person, and I enjoy running it at cons, but I am very happy that it has official FG support now so i can run it more often and for folks who don't like within 45 minutes drive.
It just feels like something that would benefit everyone in the space. But then, i don't actually know anything about the logistics of doing such a thing, or if businesses would even be interested enough to help fund it.
I still wish there was some sort of TTRPG trade organization that actually tracked data and did surveys for the hobby as a whole. It feels like we are constantly trying to extrapolate from incomplete or potentially sus data.
I think it is worth pointing out that what people are BUYING may not in fact be the same as what people are PLAYING. So comparing GenCon tables to sales data is not going to be especially useful.
D&D is popular. Every con has D&D games -- both Organized Play and whatever random stuff us con...
The point of the exercise of it being a 5.5E setting versus something like Modern5E would be to keep the rules modifications to a minimum and focus on expanded options -- similar to how Eberron and Ravenloft treat rules for their milieus.
Ah. I replied too quickly.
Goodreads -- you know, Amazon's astro-turf book site -- doesn't actually tell us much past popularity. "Quality" does not really come into it. Of course those people would pick RP1.
If The Martian and Ready Player One are the top contenders for Best Sci Fi of the 21st Century, I would suggest the creator of that list doesn't particularly like Science Fiction.