@darrin:
it would also be fair and improve their image and acceptance of their products in the scene.
When you're in business, "fair" is defined by the owner of the company.

If the expansion cards were cheap then they would offer real value for money with regards to the daughter board (especially compared to what Zorro II/III cards sell for) and there would be no excuse for "big box" owners not wanting to buy one.
Unfortunately for the A1200, it also needs a cheap replacement case option. Something for The Daddy to think about?

What's the going rate at the moment for a Zorro RTG card, Deneb, IDE controller, sound card, network card, etc off eBay? If PCI replacements were available dirt cheap then they could probably increase the price of the Mediator busboard and still sell them in bulk.