Buying cheap and re-selling is not an option in lamia, I sell earth crystals and they went from 200+ to 95 and still going down, If I buy all those crystals selling for 95 (cheap) 2 days later crystals will be 85 and then wont re-sell at all, one day they could be cheapest in market and 2 days later they become expensive, so yeah not a good idea.

I blame bots and stupid people for going with those ridiculous low prices.