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Yes, then just turn it off until stone is above 0.7 or something. That you save you on grain

I think it needs to be higher, maybe 0.8 to be worthwhile. The screenshot above of the loss making plots was taken when it was 0.7 (now).

image.png

Some of my plots are common and have crappy monsters on them, could be a factor?

Monster is not a factor. Look at my screenshots at the post for reference.

High PP monster also consume more grain, so it is wash.

Overall boost matters. At current prices at least a Rare Plot and higher, with rare totem or higher, Title, Runi etc needed to make it ROI positive.

You could be right, two more things to consider

  • if you own the keep and castle where the tax goes to (I do in my case)
  • bid-ask spread when you buy-sell resources, due to the fee the spread is 20%, did you know that?