SnGs vs ring games

[Womble]

This has probably been asked before but couldnt find it anywhere through searching. The newbie post disappered too [img]/images/graemlins/frown.gif[/img]

Anyway, what level SnG is comparable profit wise to ring games? What ROI is mediocre and good. I know 2bb/100 is good for ring and 3-4bb/100 is achievable for the lower limits.

Finally, why do you guys play SnGs instead of ring games?