I suspect a lot of these are secondary machines, and kids' machines. I have no doubt that some grandpas are buying these too to save $50, but I'd warn my relatives to stay away, except for kids' computers.
In my case, I bought my Passmark 600 and Passmark 900 machines purely as secondary machines.
My Passmark 600 machine is a SFF machine that I was using only for VPN, and it has been now repurposed as a guest machine, mounted on the back of a 19" monitor that also happens to be a guest TV. (Even as just a VPN machine with occasional surfing it was pissing me off, so I got the AMD Athlon II X3 435 to replace it.)
My Passmark 900 machine is a Windows 7 laptop that I got cheap, just so I had a Windows 7 laptop in the house. It is rarely used though, and again I got it because at the time I didn't have a Mac VPN client that was supported by my workplace. I tried to repurpose that as a kitchen laptop for my wife, but she hated it, not only because it wasn't a Mac, but also because it was so slow. Eventually I bought her a used Core 2 Duo 2.4 GHz T8300 MacBook (Passmark 1500) and she was happy with that.
So maybe Passmark 1500 is actually good enough, and indeed, my primary Mac laptop (until Skylake U arrives) is only about that speed. However, if you're going to get a desktop, and a slim tower no less, you may as well get something at Passmark 2000 or higher, esp. since it still will be cheap.