Here's a farming earnings table (assuming u can get jacob gold)

https://preview.redd.it/og44pnq470tg1.png?width=697&format=png&auto=webp&s=b19ab55421e1ebdfd239613d69d484e03db18095

While it may seem like wheat is the best for cash, there is a big catch here: IF U CAN GET JACOB GOLD. That is why the usual "melon is the best for cash" is bullshift. Always do your own calculations based on your level.

Also I'm not counting the special armor drops (cropie/squash/fermento/helianthus) to simplify things. If you want to add those, DIY.

I repeat. IT IS WAY EASIER TO GET GOLD FOR SOME CROPS THAN OTHERS.