There's an inherent assumption here that $2200 gets you a significantly better machine. It's true, but you can enjoy a massive jump in quality for probably around $150-1600. I believe that's what lubos is alluding to.
Hard to measure these things for a lot of folks but I've definitely saved over 2% of my work time from switching from spinning disks to high-end SSD on unit tests alone. Never mind the reduced boot times, how fast 'brew install' is and the general responsiveness.
If you're buying it yourself, be cheap, if you're paying someone's massive wage bill, get them the best thing you can.