Remember that SMB was being sold as part of the Humble Bundle when it was first added to the Ubuntu Software Center, and sales made through HIB aren't in that 77 figure, even if they were downloaded via USC.
Which those 77 sales are really pirate copies as Ubuntu Software Centre sold SMB without permission and hasn't paid the SMB any either. I'd stay away from them if they're willing to pull this type of shenanigans.
Regarding the Super Meat Boy issue, here is a response from David Pitkin who runs the Ubuntu Software Center at Canonical and works with developers:
"I just looked into it and the check to Tommy and Edmund from Canonical is in process for the 77 copies of Super Meat Boy. We have been working together since November to get it resolved, no piracy here just some miscommunication".
