Couldn't the card just disable the onboard cpu by setting one pin high?
MAybe, but I wanted to get these out at a fair price and reduce the cost as much as I could. Shiipping alone is $13 for me to send them to europe. I pay about $5 a board to have them made in the USA, the parts for them are another $2-3 and I have to buy packing material and take them to the post office. At $35 shipped each that doesnt leave any room for much else. I am basically doing all the labor free too.
The point was to get them out to the people that wanted to use them for the vampire in an A2000 and do it in a way that the most people needing them could afford it. I am not interesting in making massive money, its not why I do this sort of stuff for those that have followed my work. The fact they are also useful for other boards is a bonus.