Re: How many multi sng\'s till good guess on ROI?
Taking the simplistic approach of assuming you have a 1/n chance of finishing in any seat in a tournament...
The standard 5-3-2 payout structure has a SD of 1.67 buyins. At UB a 20-table SnG still pays only 3 places with double the prizes, for a SD of 2.82 buyins. I have no experience with other sites' multi-table SnGs.
For 1-table SnGs I use a rough rule of thumb that I expect each tournament to run about an hour, and based on the "10 BB/hr" rule for ring games, I equate an hour of $1/2 to a $10 SnG, an hour of $2/4 to a $20 or $25 SnG, etc.
If the average length of a 2-table SnG is between 1 1/2 and 2 hours, you can continue to treat a multitable SnG as representing similar variance to the same amount of time in a ring game with a big bet 1/5 of the SnG buyin.
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