What's the most expensive thing you've come to own that you've never gotten to fully use?

Back in December I spent $550 on a refurbrished home theater projector. After actually thinking things through, I realized that in my current living situation, the whole idea isn't going to work. I went back to watching movies on my TV and sometimes even my monitor.

I still haven't taken the projector out of the plastic wrapping, and I've been contemplating re-selling it on eBay so I can at least get my money back...but I highly doubt that will happen.