Agree with wokkerk (especially here in NY where they want to ban all things e-cig).
Other than keeping it for juice-opalypse or times of low supply, I'd keep it because you never know if you might end up liking it later on. I found that I wasn't fond of the 30mils worth of coffee juice I bought when I first purchased my ego kit and set it in favor of RY4 and various fruit flavors I liked. Recently, I bought a Lavatube 1.5 and a ViVi Nova tank with a cherry vapes Ming drip tip. Tried out one of the Nova replaceable heads (2.8 ohms) on the coffee juice I'd left by the way side and, lo and behold, it's become one of my favorite vapes. It turns out that that particular juice just vapes better at higher voltages which I would not have known a month and half ago while using an Ego-T on an LR atty of some flavor. Then there's the bit about juices tasting better after steeping for a while; some juices longer than others.
So, no. I wouldn't sell/throw out any juice until I was absolutely certain there wasn't a better way to vape it