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The way to go with this type of device is probably modularity. Create a base module with only the basic FPGA needs and a few connectors. Then create some extension boards to add outputs and inputs. This means that adding a different input board could open up a whole new market (like the NES option that was discussed here already, but I assume there are a few more out there). I think that the added number of potential buyers would outweigh the bit of extra complexity by far. Plus everybody would get a more versatile toy as well.