I believe the price of cactus should be reconsidered. I agree that afk-farms is not wanted on Olympus and I fully support that. I also believe passive income methods should be worth your time. There should be some motive to build crop farms and put your plot to good use. I have a 64x32x256 tall cactus farm built on my plot, it receives approx. 3 mill every 24 hours although it takes me 470million to rebirth. Bumping the price of cactus will not drastically impact the anti-afk systems Olympus has in place. All it will do is make growing crops a viable strategy to make money.
Assuming I attempted to afk the cactus farm for money. As of right now, I would have to afk the farm for 156-157 days in order to rebirth. Changing the price to $2.5/unit will change the 156days/rebirth to 68-69days/rebirth. This is not unreasonable.