I am new to this forum, so I hope this is the right place to ask.... Can anybody offer an opinion as to why unused Hermes bags, particularly Birkins, lose value based on the year of the stamp? The style is the same, the quality is the same, and if they are unused, why are they so much less desirable? Also, is there some "formula" for how much less they are worth as each year passes, assuming they are unused? Thanks in advance!!