semilog
curmudgeonly optimist
APS-C due to volume is by far the cheapest sensor. Comparing larger sensor formats APS-C outsells m43 by about 40:1 in the photography market.
Economies of scale apply at the wafer level, not the part level. You get fewer APS-C sensors out of a wafer.
With respect to the 40:1 ratio, I'd be interested to know what your source source for this number is. It seems vastly too high.