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This posting is about gambling and bankroll requirements to look out for.
Please share your thoughts at the end and leave a comment.

That the player is winning "decently" is not the only
information needed.
What people consider a decent win rate varies from game
to game, and person to person. Winning 6 big blinds/100 hands is decent in a
tough online HSNL game. Winning 30 big blinds/100 hands is decent in a soft
online micro-states game. The difference changes the bankroll requirements by a
factor of 5.
Multi-tabling does not intrinsically change the bankroll
requirements. However, those who play 10 or more tables usually accept much
lower win rates as "decent" than those who play 1-4 tables at the same level.

The standard deviation varies tremendously from player to player and game to
game. Some full ring players have a SD/100 of 60 big blinds or less. Some
shorthanded players have a SD/100 of 160 big blinds or more. (See the stats
threads in the strategy forums.) This difference means a factor of 7 difference
in bankroll requirements for the same win rate.