Another idea is to have a blade-like rack in which you put in compute units. It would be possible to buy the base box for ~5000$ with a few units and then add other cards as needed.
Of course, this makes cooling quite a bit more difficult, but it would lower the barrier to entry by quite a bit.
+1 this would be ideal for this product. Right-size for all (serious) budgets. They don't need to be hot-plug and would allow for mixed generations of FPGA boards in the future. Of course this means more R&D into the "chassis" which would mean we won't see if for some time...