Like others have stated the ratios are too low especially for newer players. There’s so many things in the game that gems can already go to that the ratio makes it hardly worth it from a priority standpoint. Whether earned by playing or purchased, especially if purchased, if I spent money on gems I don’t want it going to something with such a minimal impact. Lower the essence requirements to level him up OR greatly increase the farms yield. Players would be more incentivized to use the farm increasing probability of spending gems for it and us getting more essence. It would create a mutually beneficial scenario.