I find that all juice loses it's great flavor after a couple of months. If you buy some dropper bottles and only ration out what you may use in two weeks and store the liquid in a cool spot, you may be able to extend this. But some if it is your taste buds. After awhile of vaping the same juice, they simply decide to ignore the flavor. It sounds weird but it's the way it is for most people and is why folks switch it up a lot. Every time you open the bottle you lose some nic and flavor to evporation.
However, if you decide to buy that much, you can use it as a tobacco base for mixes and blends. Again, only rationing out what you will use in a couple of weeks and keeping the rest sealed as much as possible in a cool, dark spot.
Have you tried these flavors yet? What if you don't like them. There is a lot of popular flavors I don't care for.