What I find interesting is how quickly they made the decision. It was launched less than 4 months ago.
It looked like a good service, I heard good reviews, and while I'm not against the "shut things down that don't get traction" idea, 4 months seems quite tight for something that was at least making some money. A lot of the most successful products take much longer to find their feet (although I appreciate this was just a side line and not the next Skype or Facebook).