[BrianG]

It's true, their selling value drops over time. But if everything works once you get back, it's still worth the same to you. Did you buy everything thinking it was an "investment"? If so, you should've looked into buying land instead. ;)

Seriously, if you think there will be something bigger and better by then and won't use what you have, then it makes sense to sell I guess. Of course, technology always increases over time, so it's hard to say.