Yes I am aware of those items being ingame. I have 2 watermills which I got on events which is not nearly enough.
Anyways, with silo costing 750 gems and watermill costing 895 it would take me sometime to gather the gems up in order to buy just 1 of those. Meaning I would have to play this game for a year just to merely suffice resource refreshing that would match my current production rate and production needs for those resources.
Not everyone can afford themselves the luxury of paying for browser game currency and I use all the gems I get from logging in daily to buy houses which I also need since adventures tend to require a large amount of troops needed in order to complete them so I must have plenty in reserve. Silo only replaces 1 wheat per cycle per wheat field which means I will need 33 silos on maximum level to suffice the replenishment of wheat for my current production. That means I will need 24750 gems to buy and that will take me 380 weeks to gather with current 65 gems per week. And that's only to match the current production. I really don't have 100 euros to spend on a game since where I come from, people work half a month to get that kind of money... I don't even want to think about watermills.
From your response I can conclude that you wont even consider this suggestion being that it would make those 2 items less worthy. Which leads you to presume their purchase will drop which leads to less gems being spent on them which leads to less gems being bought and you know to what that leads...
I will be leaving the game since with current gem awarding, gem cost on items and the way the resources work I see no point in wasting anymore time on it.
Thank you for your time and good luck with your online business.