Well before we get too carried away with this, two questions: Do we have any idea on how many arcade cards were made? Is it possible to reproduce them if we needed to have more?
I think that the more important questions are:
How many copies of any one Turbo/PCE game have been sold (or more to the point, how many single people bought copies since many by multiples)?
How many people who actually play homebrew games actually play them on real hardware exclusively?
If an ACD game is going to be sold for $30 - $40, then the cost of buying an Arcade Card if you need one only brings the overall cost near the rapidly selling retail price of Pier Solar. But if the hope is that as many as one thousand people will buy the game, I don't think that the supply of Arcade Cards will be an issue.
It would be different if you were making a unique system card to go with a CD game (like Games Express) and the combo would retail for $200 or something.
Are there any Knock-off system cards around? That work for all games?
Pardon the ignorance here but would it be possible to create a compatible sys card with the Arcade specs? not taking into consideration costs or anything like that, just curious.
They are unique and only work with one to a handful of games designed for them.
Some people have been working towards a "super" Arcade Card that would work on either region and do extra stuff, but it's still a ways off.