We use lots of M/C cable, and as for what it's worth, wouldn't have it any other way.
Your "price per opening" reduction in cost seems about right. (You'll really notice the labor cost go down in wood construction).
Make sure the crew understands the cost involved in material, though. There's a tendency for guys to pull off way too much cable, then cut off the tail and leave it on the floor, creating a lot of waste.
Homeruns and straight shots are still better done in EMT, but for walls and lighting, the M/C can't be beat...S
