With a standard deviation of 80 ptbb/100 and a win/rate of 13ptbb/100, what is the chance of going busto with a 40 buyin bankroll?

I have no idea how to figure that, but my guess is the chances are going to be low.

Who has a SD of 80? Thats insane.

Me?

It's PLO though, they say swings are a bitch

This might help

http://www.poker-tools-online.com/riskofruin.html

i plugged it in and got 0.03%, and that seems about right if you have such a big winrate.

iirc, this kind of model also assumes a normal distribution of outcomes/100 hands, and this is probably NOT true due to kurtosis (armchair stats commentary -- might be wrong).

anyway, i think you might experience several double-digit buy-in swings, so get ready for the roller coaster ride. badbeatphil had an sd of about 100, iirc, and his swings were crazy. make sure that you can avoid monkey tilt so that your winrate remains high and positive.

SD of 80 may not be all that big in PLO. You didnt mention that in the OP.

You also need to conside that 2PTBB/100 at $1000 tables is very different from 2PTBB/100 at $50 tables in terms of win rate net of rake.

For example the rake on a 6 max table may be 4PTBB/100 at the $50 ones and 1PTBB/100 on the $1000 ones (these figures are just guesses btw but you get the idea)

In one case the adjusted win-rate net of rake is 6PTBB/100, the other 3PTBB/100.

You can usually get 30-50% RB of course.

The long terms risk of ruin of the $50 player is much lower.