I'm not talking about cutting every single corner until you arrive at total garbage. Like I said, I don't understand manufacturing realities beyond my own tiny place in the world. I just know that extremely inexpensive decent quality plastic shit is all over the place. I can buy a USB mouse for $10 that not only has a case construction more or less the same as what you'd want from a HuCARD tray, but also a shitload of electronics, a cable, some logo, etc and, aparently, some sort of profit margin built in. A typical $20,000 car has easily several thousand IP components. If they all cost what was quoted for HuCARD trays then the same car would be half a million bucks. Ever been to Harbor Freight? All that stuff was made at a profit and it costs almost nothing. Do you think the local law firm is paying $50 a piece for those promotional snow scrapers with their name on them? Of course not, because a snow scraper only costs $8 retail.
I think there is a way to do it with IP within reason and I have no idea how, but I'm sure it wil be done, probably soon, and probably by some other group, like the people that seem to make things like blank NES carts, AES shock boxes, flash cart housings, and all sorts of shit like that.
I'm mad busy these days but I will try casting them in the next month or two.
All of the items you mentioned are produced at ridiculous economies of scale and are, for all intents and purposes, very generic items that have been refined and commoditized for decades. There is a known market, for decades, for computer mice and windshield scrapers (assuming you live in a climate cold enough). I was surprised you didn't mention ballpoint pens, plastic water bottles and combs.
I think you take for granted that a lot of the early design and revision (iterative process occurring with each successive manufacturing run) for generic goods were accomplished decades ago.
You can't compare generic, universal items produced in the millions with quirky little HuCARD trays...
Also, what relationships do any of us have with manufacturers/suppliers to negotiate better prices? We face the same problem with shipping/freighting charges...
What possible leverage could we have when we want an absurdly small run of mere thousands (10,000)...which is a nuisance?
Where are all of these items going to be stored for the next decade or two (assuming they aren't defective and unsellable)?
This is assuming that we get really lucky and the first batch is pretty much a perfect design, with materials that prove durable and aesthetically pleasing for a long period of time, and manufactured to exacting size specifications (tray covers are not too tight, not too loose, swing freely, and hold manual firmly).
Also, hopefully, the item won't smell like formaldehyde for the next 25 years.