Of course they'll do it if you have the money. But is it worth it? I'm certain that if I show up at the door with a billion dollars and offer it for a master roll of Kodachrome all cut up and packaged they'll make one for me. But if I show up with less than it's worth to them to waste the time they won't do it.
The question becomes where is the meniscus where you tip over the edge between "this ain't worth it" to "ok, let's talk" and whether that point is on the correct side of the other curve, "Wow, how much is this really worth?"
I for one was never a big 220 shooter, but I know others are. But is it worth 2.5x the price of a roll of 120? What if they want 3x? 4x?