Getting a rakeback or not?

[limodude]

I have spent alot of time understanding rakebacks and how they work due to the wonderful search function of this forum. But my question is this. Currently I play 5-7.5K hands per month at .50/1. I have just about completed 10,000 hands at this level and am considering moving up. And obviously I jump around and bonus whore just like the next guy. But to make the rakeback effective you should probably just play one site that gives you the best rake return and obviously keeping in mind the best site in which to play. So at what stakes game does it make sense to give up the bonus whoring and just focus on one or two sites with good rakebacks? Thanks in advance.