Hi Dan,
A few years ago, it was often mentioned that the MFD market may be 10000 cameras a year or less.
A few months ago, Lens Rentals published it's "Most Popular Photography and Videography Products of 2018", that places Fujifilm on 4.67% 2017 and 4.25% 2018. So, it seems that the GF system may not have a large impact on Fujifilm rentals.
Would Fujifilm sell 20000 GFX systems a year and and would say 5000 of that be GFX100, we may assume, just as an example:
NRE costs, say 20M$US (Eric Fossum indicated like 10M$US on a sensor based on an existing pixel design, but this is a new design)
Say that pay off is calculated for three years. So, that would mean 2e7 / 15000 -> 1300 $US, just covering NRE costs. To that comes production costs.
Pricing is actually about what customers are willing to pay, more than about costs. Any manufacturer selling below fully covered manufacturing costs will go kerplunk over time of course.
Best regards
Erik
If we're looking at "several million into NRE as an investment" on a sensor that has (so far) appeared in one expensive camera, there's quite a bit of that investment stuck to each sensor. It's a guess, but I suspect Sony is attaching at least $1000 extra per sensor to cover that investment, the opportunity cost of making the sensor in a newer fab (the 50 MP is probably made on a line that has fewer other possibilities) and extra profit on a new product. It could easily be twice that...
Another guess: Fuji is charging the end user about twice what the sensor costs them for the sensor difference. Much of this is margin, but it also covers things like a unique filter layer.
This puts the total sensor (and filter stack) cost difference at retail somewhere between $2000 and $4000 from a GFX 50 to a GFX 100. This doesn't count the cost of the (limited-production) IBIS unit or anything else aside from "what's your best guess about what the sensor's responsible for".
This is based on a production of ~1000 cameras month (or possibly less). Those are D3x-ish numbers, and I can't think of a better comparable (for which the numbers are available - Nikon numbers are easier to get than anything else). The scraps of information that have come out on medium format suggest that the much less expensive GFX 50S and R probably sell somewhat better than the D3x ever did (especially in combination), but that nothing else has probably reached D3x numbers (the ONLY information I have on the Pentax is Fuji's statement that they "doubled the size of the medium format market" even before the GFX 50R). If the Pentax had been selling 1000+ per month plus various Phase and Hasselblad models, Fuji would have to have been selling quite a few cameras to make that true...