I will tell this straight away: you can farm MP 10, as in farm, with 2.10 aps. I did it. The DPS was awesome I killed so fast compare to higher aps. The lower your aps is, the higher your real DPS becomes, the higher freeze strength of higher breakpoints don't mean anything if you face 3+ targets, in this situation low aps is far superior.
Troubles come from defensive side, and single target situations. I couldn't tank/freeze !@#$ and had to move quite often. Also single targets run away too often and chasing them is really tiresome. But if you are ok with that, even 2 aps is fine, I think there are many players who don't mind chasing, just make sure you have enough DPS to not chase for too long. Personally I prefer the smooth process higher aps offers, I accept the loss in multiplier just to do continuous DPS without having to move too much or kite.
One more important thing, while I agree that you can /do/ Mp 10 with 10M or 20M, try to use it as your main gear, and farm with it everyday. You will see the problem, your hands will go numb, and eyes become dizzy because everything takes too long to kill. Wiz from high level gear building a cheap set don't understand that the cheap set is not viable in reality because we are human so we can't mash buttons non-stop. I have been there, as a Wiz going up from scratch in EU server, and I really could farm MP 10 with my gear, but I didn't, because no sane person could stand long fights after long fights with 100k DPS in MP 10. I wanted to farm MP 10 right after I reach the 100k mark, but then I realized that I may do one or two runs for fun but to farm repeatedly in MP 10 with 100k DPS is just impossible for normal players. Too much effort for human body. And we all know that after 100k DPS everything will become more and more expensive.
So in conclusion, I have seen many budget builds for MP 10, they make MP 10 "doable", but no way "farmable", unless you have the best tenacity in the world, or you use automated programs.