Considering the number of different language Blitz communities, the stuff some of them churn out (the French community has done some amazing stuff!), and the constant flow of people posting in the Beginners forums here, I'd say they sell a fair number of copies :)
Sale Figures
Miscellaneous Forums/General Discussion/Sale FiguresThe forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.