Thanks for the confirmation on the daughter board.
Yes I know it's quite expensive when new, but as it's a quite outdated design, if you really want it to sell, you'd better lower the price so it can compete with "nowadays" electronics which do more and better.
This card has no microstepping, making the motors quite noisy.
You're getting stuck with old 5D firmware if you don't do electronics modifications.
etc...
People can buy sanguinololus and 4 stepsticks for around 100$, so IMO you may have to lower a bit more if you want to sell.
Most of my technical comments should be correct, but is THIS one ?
Anyway, as a rule of thumb, always double check what people write.