I wonder what % of hardware/OS/driver setups that Blitz3D fails on. I'd imagine that these days, Blitz3D games/apps can run on 99% of machines. Regardless of the %, a higher availability is very important for sales.
I can't possibly speculate, but I'd guess that a Blitz3D app/game has more of a chance working (and hence selling) than a C#+TV3D app/game.
I can't possibly speculate, but I'd guess that a Blitz3D app/game has more of a chance working (and hence selling) than a C#+TV3D app/game.