Flash carts and other sorts of copying devices existed before games were collectable so I think that sorta pops that theory. It's only logical that someone really into a game system would want the ability to run unlicensed code. Most consoles are unnatural in that they don't normally allow this. Flash carts fix that problem regardless of ones motivations, cheapness, OCD, homebrew, translations, whatever.
The fact that they cost so much less than they used to is right in line with pretty much anything in popular electronics costing way less than it used to.