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I've done a lot of extracting, and now harvesting, since I picked up the trade skill. Harvesting is pretty much awful. Places like the forests net very very little in terms of plants. Deserts are even worse. And let's not even talk about the rivers, cause I'm liable to go into a seizure.
Extracting minerals is so much easier than harvesting plants simply because you can get more. I think that harvesting should be brought in line with extracting. Plants should net more, period.
How the hell people are selling plants at anywhere from 3 per to 6 is beyond me. The scarcity alone is going to force me to bump up prices to astounding levels. Either that, or Eleusis is going to get minerals from me!