It wouldn't matter as GF/MF are nor averaged anymore I think. I don't play with others often not because I don't like it, but because I'm always multitasking, and sometimes I leave a game on pause for half an hour or more while I do some other stuff. I mean, I have D3 running with a 5 stack right now, and I'm on my phone in another room
That's the reason I can't bring myself to finish something like Demon's Souls, I'm terrible at playing something for more than 20 minutes straight.
I think I'm going to try and maximize my MF again and run Act I as fast as i can. I need to try some of the new legendaries, and they used to drop like candy there for me.