While I'm sure a lot of people would be willing to (depending on the price, I may be one of them -- I'm a big fan of RescueTime), my understanding is that they are targeting businesses with their paid version.
"Not sure I would ever pay for software to tell me where I am spending my time." --- Maybe not you, but your boss may. Rescuetime needs a function, where it can work in the background, so bosses will see what their employees are doing online.
I worked on a big financial company, and they monitor a lot of stuff. I wouldn't be suprised that they will find something like this useful.
VNC gives them a very fine-grained view. At any moment I can watch what any individual employee is doing.
That information, in and of itself, isn't very actionable. I'd prefer knowing that, on the whole, 10% of my company's man-hours are spent on digg, for example.