How many BB/100 is game selection worth?

[7ontheline]

Currently playing Party 5/10 and I have an unsustainable winrate over ny first 6k hands (thankfully, it's a green number for BB/100). Anyway, I feel (perhaps undeservedly) confident that I am a winning player considering the level of play I see, but I haven't come anywhere close to statistical significance.

In any case, my question is how much do people think proper game selection adds to your BB/100? I have really made an effort to pay attention to this and it seems to have been well worth it. I leave tables full of TAGs and I follow my favorite donktastic fishes around. Due to having a regular job, I end up playing only at prime hours in the evening, particularly on weekends. Do you think it's worth a whole BB/100 simply to always play against the worst competition possible? More? Less?

P.S. Apologies if this topic has been discussed to death previously - I'm too lazy to search right now. I'd rather just have my info spoon-fed to me by smarter posters.