On my last brew, I was weighing up doing it BIAB split between two pots as that is the equipment I have at the moment.
However I decided to stick with extract for two reasons
1) I have 13kg DME in stock
2) Even if I were to buy the grain in bulk, the cost of the grain is not much less than using all DME i.e. $13 for grain vs $16.50 for DME, add on top of that the extra time taken and the fact that the brew in question tastes awesome anyway. It's hard to justify.
That being said, I'm fairly sure that I will end up doing AG at some point, it seems like a lot of fun.... maybe when my two month old is less demanding!