Winrate as a an indicator of when to move up

[VegasRunner]

Let's pretend I'm a no limit player with an unlimited bankroll. My goal is move up to bigger games while constantly remaining one of the players at the table who is getting the best of it as he moves up the ranks.

What kind of a hourly rate (BB per hour) is a good indication that I am ready to move from 1-2 to 2-5? How about from 2-5 to 5-10?

The reason I'm asking this question is that so much information is posted about the size of working bankroll (usually in number of buy-ins) in relation to when to move up when that really seems like a secondary concern to me.

I know it's important not to go broke, but hourly rate seems like a better indication of where I am as a player.