In eggwars the emerald spawners are a really wasted opportunity, I think that the problem is not that their shop is overpriced but the problem is they require you to sit in a really small radius and wait for so long which encourages camping and it is not fun. I have never seen anyone use emerald shop items and I think that is a wasted opportunity, So I think by removing the need to stay in a radius for emerald generators would make them more viable and used.