bigboss said:
It's not that straightforward. You could argue that every single smartphone in the market can have the highest specs as it "only costs a few pennies". But the market forces decide the final cost. The projector market is still very small. That's why you don't see Samsung or LG jumping into making them. So you need a decent profit margin to even think of manufacturing them.
You can buy an Android 4G smartphone on Amazon.com for as little as $50, or spend $700 plus on an iPhone 7. Both will "do" most of what the other will "do" (like make phone calls, surf the net, play Youtubes, and take pictures) to a greater or lesser extent. Do you REALLY think an iPhone costs ten times as much to manufacture as the el cheapo brand or do you think marketing and mis-placed (IMHO) label "value" have their parts to play?
Yes, the market for projectors and screens is smaller than the market for ordinary TVs, but if you saw how many 60 inch 4K TVs BestBuy sells in comparison to 32 or even 40 inch 1080p TVs these days I think you'd be very surprised. Such TVs can only be found at the backs of the stores for a reason. My point being if / when the prices for 4K PJs come down to more affordable levels, around the US$1000 to $2000 level that current, decent 1080p PJs are, the market would burst wide open.
Now let's think about manufacturing cost. Suppose you build a machine to make the one chip that is crucial to building a 4K PJ. And let's say, for argument's sake, that machine costs $10miilion. And let's say, for argument's sake, the raw materials, electricity, etc. add up to $10 per chip. If you use that machine to make just one chip, that chip ends up costing you $10million for the machine plus $10 for the materials, etc., total $10,000,010. Now let's say you make 1000 chips. Now the total cost is $10million for the machine, and $10,000 for materials, etc., total $10,010,000. Divided by 1000 chips, the cost per chip drops to $10,010 per chip, or about 1/1000th of the one chip. Make a million chips and the price per chip drops to $20. So economies of scale really do matter.
The "why" of "why 4K PJs are so expensive" has, probably, in my opinion, more to do with patents or other IP issues than anything else, and I'll leave it at that.