*sigh*
Can we all at least start by agreeing that the number of tables you're playing has zero effect on your variance?
LOL
Don´t understand this until read 2nd post of Zack, yes, agree with you with that Oz. tables played have nothing to do with variance.
Now, by general rule i know that most people say that #tables played have nothing to do with the buyins required, and to some point is true. In teory with 50 buyins have the chance to play 50 games, no matter if are 50 games in sessions of 1 game (50 sessions) or 50 games playing 2 tables (25 sessions), you should be safe to not go broke (if are a winning player if not will go broke 1 tabling or 20-tabling), but also need to consider that is not the same to risk less than 10% of your BR at a time(example 4 tabling with 50 buyins), to risk 20% 8-10tabling or 40% of your BR if want to 20 table with 50 buyins.
I think your point is that BR is for protect to not go broke because of variance, and looking in that way that you play 1 table or 20 have nothing to do with variance. True.
But varience also is not something that you can measure in games, i mean stadistically some people have bad streaks of 20 buyins, some more, some less, but that don´t mean you going to reach the game 20 and variance will stop.
We see it every day, some times it take a couple of days when you dont hit nothing or you hit and other hit harder, or your 80/20 never hold, some times take more than a couple days, but how you measure how long will take?. If some one play 100 games and do it super great could be a heater or if go super bad could be a downswing.
I think there is where #of tables make his important prescence, if your bad days going to last 2 days no matter what (just and example) and you only 4-tabling maybe you go 8-16 buyins down depending how much games you play, but if you play 20 tables can end busting all your BR just in that, not because more tables mean more variance, but because more tables means more games inside that variance (good or bad).
I mean, variance is not only downswings, we all have sessions when you win everything no matter what, and you want to keep playing and playing, the thing is what when bad variance come, have couple of horrible days, even take a break and downswing go all the week, and not because bad play (maybe also bad play but not only because of that).
In other words, like you comment variance is the same playing 1 or 20 tables, but if variance come still will hit but if play more tables means could hurt more your BR.
For that point of view i don´t see wrong have more buyins if play more tables, and not because more tables mean more variance, but because more tables mean more games inside that variance, and more % of your BR in risk in any given time.