For me, MB'ing has always been about convenience, first and foremost.

I have a set amount of time to play each day, usually not more than 2-3 hours. I don't have time to run Naxx PUG and personally, I find it irritating doing PUG's in general.

I have farmed the same 3 heroics for the last month (Gundrak, Drak'tharon Keep, and Utgarde Keep) and have a lot of upgrades, as well as a ton of DE stuff. I am ready to raid now, if I wanted.

As it is, I am looking to go to Naxx, but with some friends that I have on my server. They are not geared well right now, but we are working towards it. I am also planning on leveling up another group (mixed this time) so that I can continue playing the game on my own terms.

That's what it really boils down to for me: playing the game completely on my own terms. That and the fact that I will know that EVERYTHING that my bots have has been through my hard work alone. I take a bit of pride in knowing this, even though their gear is not that good.