I reckon it's probably more his markup etc.
Built to a price that works for him business wise and where it actually works (they are a really, really honestly priced product) and hasn't got the room, nor the interest to play with it.
They really, really are worth trying to work out a group buy on at full retail for anyone waiting for a reason to purchase.
Maybe a BBQ and installation day with a workshop that installs them would be worth looking into?
Seriously - anyone is welcome to take my car for a drive and see why I'm so happy with what they have done with their hard work if they are even half on the fence. 6 months later and I'm still over the moon.