5 or more computers?

Looks like a number of people on the ThinkPad forums have more than 5 computers. Ah, I love computers, and I could easily use the capabilities of faster ones, and with Synergy, use more than one at a time. But I really only have one working computer, mainly because I’m saving money. I’ve been taught to be very frugal, so I only spend money when it’s really necessary. And thus, I wonder what opportunities I’m missing out on– like installing OS X on a ThinkPad. A dream for me, but as prices come down and my income goes up, hopefully I will afford it.