That is correct, The clutch is only used when taking off. With the 5 or 6 spd, You could dyno the engine, find its peak power curves and build this geabox to fit those RPM's..
Really if you think about it, I wonder if we are looking at these gearboxes the same way most of us look at a set of golf clubs??? 275.00 to 400.00 per driver aka our 20K-50K on the engine) but most of us have a 30.00 putter in our bags!! And we use the putter more then the driver!!!

(our trans are most important pieces of equipment to our cars. Catch my drift?
I cant justify the 15k to 20k price for a street driven car, But if there was a circuit for these things and some money to be made, I would be all over one. orif they could get the cost to under 10k. It just seems funny that some of the guys that have 100k to 150k in there cars, dont have one. (Maybe i will sell a pace car to buy one??? NOT