Do gravity-based defects outweigh displacement defects from fast particles?
Also, there are large headwinds from having to ship up a large quantity of raw material and have to deorbit a payload so fragile that any amount of shock is unacceptable. Maybe a high purity silicon boule pays for these headwinds with room for profit on top. I'm skeptical, but time will tell.
It would be pretty easy for them to have done the math in advance and I’m sure they’re aware that space travel is expensive.