According to their website they have 1000s of customers paying 1200+/m. At the low end they're getting 1.2 million in revenue a month and only have 9 employees. Why did they sell? Something is not adding up.
According to the pricing page, Get Satisfaction's only public pricing is the $1,200/mo subscription. ZenDesk starts at $25m/agent for the community solution.
Granted, they are slightly different products; I was just grabbing the nearest competitor I could think of. (They're in the same space, though, and competing directly for the community/knowledge base part of their products.)
Not sure where you're seeing 9 employees. At the end of 2013 they had 40 employees, and while they laid 10% off in early 2014, they still had over 30 a year ago. Larger customers (of which there weren't 1000's) were paying much more than $1200/year, too. But still, the money coming in wasn't anywhere near the burn rate.
There were more than 9 employees at GS - about 40. There's only 9 employees / former employees that have CrunchBase accounts, so that's why you're seeing that number.
Edit: Actually $1200/month according to the pricing page, nevermind. That's insane, and way above competitors like ZenDesk.