> What’s the point of a 300$ keyboard that minimizes movement when you have to move your entire hand every time you you need a mouse?

Because I rarely use the mouse (trackball in my case), and if I type on a 'regular' keyboard for any extended period of time I will experience discomfort; whereas on the Kinesis Advantage I don't experience any discomfort.

300$ seems like a steal to me!

(Not that I paid. My company did.)