You can sell anything cheaply if you make it cheaply. This thing loudly proclaims 2000 SURGE WATTS! and then in small print notes that its capacity is 1500 running watts. Coupled with the fact that it is being sold for 50% off list price, I suspect it doesn't really live up to expectations, and TSC is trying to get rid of them. Reading some reviews it appears the build quality is poor, some of the components are prone to being defective, and the voltage output is not regulated which can cause damage to electronics.

If you have equipment critical enough that you need to keep it running when the power is out, it's important enough to buy a reliable generator for it.