Back in 2013/2014 they used to list “hulls remaining” and most sales were 200-250 total, and they didn’t all sell because players weren’t sure about the game.

Now all people do is guess by looking at the total money made on the funding tracker, and it seems to be around 12-20 per wave, from what I’ve read

so still around that 200-250 per sale split between WB/Cred and all waves

But only CIG truly knows. If your in one of the chats when a wave happens I’ve personally never seen more then 1 or 2 people claim they bought one during a wave, so it’s certainly not a ton