Problem with that logic is that you assume the eye to be super easy to get, which is not. Typically, a shard is the reward of a week worth of daily quests. Ten shards make an eye. Alternatively, each Ragnarok advent event success gives you a demonic core. 3 cores for a shard for exchange i.e. 30 cores for an eye. Finally if you are lucky (or unlucky, depends on your stance) in SSR kamihime draw, you get an Eye. Furthermore, to trigger the awakening, the SSR hime herself has to be level 80. So that is multiple hurdles for a power boost, new harem scenes and some bragging right. Not so worth it especially if you don't main that element.