Also, to the creators - it would be great to have a "pricing" page to explain this!
There's also a lot to be said for pricing simplicity, though. You might consider just having a "premium woods" option that gives you access to the high end veneers, rather than passing costs directly along. If you make it more complicated, you'll also cause people to do a bunch of re-renders, which may wind up costing you more (and causing people to get bored and give up).
I don't envy you the task of working with fraction-of-an-inch wide irregular-edged burl veneer strips!
Edit: Longer version: It is because of his noprocast setting.