Seems to me, if the snacks are your snacks, it should be up to you whether or not you want to sell them. No auction things you can sell out of your backpack. You paid for them, farmed them, harvested them or what have you . . . Why - if I have 80 Killer Kumquats that I am certain I will never use because I don't use anything but rank 9 snacks - can I not sell them and make a profit? I paid real money for the Sword Ferns that dropped them. Seems like it's only fair that I should get to sell them if I'm not going to use them. I would very much like a response to this.
It's the same as gear. There are some items that KI do not want newer, inexperienced, non-paying players to have access to. You can still sell the snacks to snack/reagent vendors, as they're no auction, not no sell. But to me, it seems like you're overlooking the Killer Kumquats quite a bit, it's a great snack for when rank 9 snacks aren't plentiful. For instance, if you run out of Crowns for Mega Snack packs, or grow tired of farming for Hambrosia. I'd personally use them now, if not, then you should probably keep them around in case you want a pet grown but have no rank 9 snacks.