Heh I seem to always miss when you are not being entirely serious

Since there is no "right" answer to this question I guess any answer is as good as another. Your suggestion looks good but SD = 7 starts be in the higher-variance category IMO. BTW, I have seen players describing some MG games as very high variance here, yet my simulation has revealed that they have SD less than 7, so go figure...
Re: pulling your leg. I know - I have to be selective in my words. You have that subdued Finnish sense of humor, and I have that aggressive North American sense of humor.
Well, if we apply the precise numbers above (we have one game with an SD of 8.0), then our set has 4 low-variance, 5 medium-variance and 2 high-variance slots.
Based on historical game play data at my current deployment, it appears that most of the game activity (the vast majority actually, much greater than the 9:2 slot count ratio) occurs in the low and medium variance ranges.
The average bet per game in many of these slots is high. I can't give precise values as I consider that proprietary information. I believe it is safe to say, however, that the average game bet is a great deal higher than min coin count/coin amount with max lines.
From this I infer that most of the players enter the game with a starting balance that is more than sufficient to handle the loss statistically expected to occur in order to get that "big hit" from a higher-variance slot.
And from this I infer that the choice of the low to medium variance slots does not have to do with the player's initial starting balance. I think the numbers indicate that the vast majority of players simply prefer to play low to medium variance slots.
Of course, all of this applies only to our admittedly limited and, according to many, only marginally entertaining assortment of slots.
[In re-reading this post, I concluded that it is a bit of a derail from the OP. However, in 12 pages
from an earlier thread we never managed to get this close to the translation of math to game play as we have done right here.]
Chris