They are more interested in something that sells well as it produces a nice profit for them - they are not interested what happens to the coins , if they are passed on as genuine etc
Yes, I'm conscious that I'm telling the manufacturers of these coins where they need to improve although that assumes that they're trying to produce absolute copies, which I'm not sure is true.
I don't really track US coins but yeah probably the high mintage would be part of it.
I'd assume that collectors are very much divided (like here) into classic (1960s or earlier) and modern (alphabet sets/state quarters) and maybe these sets fall in between.