Electronics lose their value all the time. The moment you open the shrinkwrap, it loses at least 20% off your purchase price..

If you're not buying it as a 'toy' to tinker with or for development platform, then you should only buy the device when you're 100% sure it'll deliver all the features and functions at the quality level of your expectation. Anything beyond that (future upgrades) should be considered as BONUS. Don't buy a product based on a promise that the vendor has made but not delivered yet.

Otherwise, you're undermining yourself.