fwiw, i 4-table and sometimes 5-table, but i didn't get there because i was bored. i got there because i went from one table to two and when i was good enough with keeping up with reads and notes and general play i moved to three and then after another a couple thousand hands i felt comfortable enough to move to 4.

IMO the line of thinking of "i get too impatient playing at just one table, i'd do better if i opened up three more" is about as flawed as "damn, all these donks keep calling down my bluffs down with garbage. i'm gonna move up a limit where people actually know how to play."