I can sympathize with the cost aspect, and it absolutely does matter! However, at the current prices they are already charging, these units should already be coming standard with something decent. It shouldn't be extra. If you're going to sell a full fledged solution, then make sure it meets that requirement in every way. When I originally bought the BDP-1, the features and Manic Moose feature seemed fine for the time. However, no way I would consider a BDP-3 as it comes today with its native MPD/Manic Moose. The only thing driving that purchase would be SQ. If I was just building around Roon, I'd also explore other options, especially those that sound well with Roon.
Or you can be like other manufacturers that are only concerned with the hardware and make it very clear that they don't want to deal with the software side of things. They'll either say use DLNA/UPnP or use the hardware as a Roon Ready endpoint. There are products on the market designed with just Roon in mind for example.
From a price point, I'd be down for that solution as well. Forget MPD and Manic Moose and USBs, just make it network only and have it sound as good as possible as a Roon endpoint.