A 31.5" color e-ink poster is ~$1700[1]. I do not know what these large panels cost but (possibly due to low yields) eink panel prices seem to scale superlinearly with area. I would expect a 75" panel that is five times larger to cost more than a used car.
Anything can become a "best seller" if you are able to arbitrarily lower the price by multiple orders of magnitude -- $500 luxury cars would fly off the lot but would not be profitable.
Anything can become a "best seller" if you are able to arbitrarily lower the price by multiple orders of magnitude -- $500 luxury cars would fly off the lot but would not be profitable.
[1] https://inkposter.com/products/spectra-133