you can make more money by investing in items and flipping them.
i don't usually like to flip, the only flipping i ever do is decanting because i'm 100% sure of the profit that i can get. decent profit for prayer pots and flips immediately so you don't have to wait for the market
but that's not great money as opposed to 200-ish for minerals to 1.5k for rocktails
besides i'm not in it for the money, i would rather have the skillcape