Plant cultivate actually makes more than Spores - I have tested it myself although it comes at a very severe cost. You risk affecting the nerves of your hands spamming that fast and that much. It can cause nervous disorders, disorientation, Early Arthritis,OCD and severe muscle ache . I am being serious regarding the health disorders. Its not even fun and its extremely painful. You people (who are using this method) should not swap your health for Zeny.
Despite it being a more zeny making method , I severely discourage anyone from using that method.
If I am to make an anime like comparison here - That method is like Luffys gear 2nd or Narutos Wind Release Shuriken lol.
Powerful but at the cost of reducing your life.