Although dragons eye is a difficult item to obtain, from the devs perspective its less of a "ultimate item that will take you months to collect" and more of a "better luck next time! item in case you get an SSR you already had" In any case, spending them in grails sounds like a smart decision for most people since the only other thing you can get is a guranteed SR (which lets be honest, will probably suck) or an SSR (which takes 10 so by that point you ve either played forever and you dont need to get your weapon lv up because you ve spent so much that you re getting copies of SSRs you already have by the dozens).