How did you "throw away" $2500 in resale value if you would have paid $2500 more to buy the '15 model?
Maybe the other dealer dropped the price due to an allowance from Honda. But either way, you apparently could not have bought at the lower price on the day you bought your '13.
As far as the Rune, they are very cool but I doubt many owners would tell you they were a slam dunk investment winner.
If you are already concerned over resale 2 weeks after buying, maybe you chose the wrong model of motorcycle, and not just the year of production.
Hope you can enjoy your F6B.