24 stats (6 attributes per four characters). Your point is still valid though.
Gack, as I said, I'm not a statistician. Or, apparently a graduate of 4th grade math. Sigh.
You're asking how many of my players have to play the stats they roll? All of them. Them's the breaks. They roll them up in front of me. Lots end up under 9. They have stats ranging down to 5 in the SCAP game I'm running now.
On the other hand, how many characters have a prime stat of 17+ under point buy compared to rolling (before racial adjustments)? A heck of a lot more.
So, out of 24 stats, you have 3 or 4 stats that are 9 or lower before racial adjustments? You sir, are an insipiration. In all the years I've played D&D, I've never, EVER seen anyone play that way. I've seen all sorts of nudges and winks and not once have I seen someone actually take the six they roll (unless they rolled well all the way through).
Well, by point by, when you say 17+, you really mean 17 or 18. And, if you go 25 point buy, that 18 is going to really, really hurt you. In my current game, which uses a 27 point buy, I think 1 out of 7 characters has an 18 before racial adjustments. Granted, this is a 3.5 game, so maybe that makes a difference.
But, if you go by 25 point buy, you probably won't see many 18's. An 18 is 16 points, meaning you've got 9 points to spread over the other 5 stats, and it costs you 2 points just to avoid the penalty for the stat. A single 18 means you've got at least one score of 9 or less. And most likely two or three. I see an awful lot more 16's.
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On the Far Realms
There's a pretty good reason, in my mind, why the Far Realms has gained popularity. It's different without being difficult to use. Anyone who's played for a while has likely used humanoids. They've also probably used demons/devils as well. Far Realms creatures give you a nice, easy to use bad guy that hasn't been done to death. F.R. creatures are bad, so you don't have to worry about moral quandaries miring your game. They come with built in cultists, just like demons/devils, so you can use them at almost any level. And, they're new enough that it's unlikely that your players have memorized their stats, or even met them before. Meeting a Vrock is pretty blase for an experienced D&D gamer. Meeting a tentacled beastie is new.
I'm sure a few years down the road, it will be something else.