Does an iPhone 3G (in excellent working and cosmetic condition) have any collectible value? If not, do you think it would in the future (if it stayed in the same condition)?

Clearly the 1st gen iphones have collectilbe value if they’re in excellent condition, and the 3G [not 3GS] seems to not have collectible value at the moment. I’m asking to find out whether I should care about preserving a 3G’s cosmetic condition and battery condition, in case it becomes valuable in future years.