I gathered some Wells in the last events (when they were still available) and also got many genies (many - as 5-6, lol) and now, being in the holiday between chapters, I placed ALL of them. By far, the Wells are more generous than Genies. I am not even thrilled when I win another Genie, in fact, I have other 2 in the stock and don't feel like I have to find free space to place them too.
Wells should be introduced as rewards in events. I don't think Inno would die from 1 well/ player.
They are more generous as in "give diamonds more often"
But 1 single 200 reward is worth 8 wishing wells rewards
1 100 reward is 4 wishing well rewards
1 50 reward is 2 wishing wells reward.
So you get diamonds from the genie much less often, but then you do you get the equivalent of many many times the wishing well rewards.
Thats why I said perception and reality are different.
If you get twice the 200 reward in 100 days, thats almost as much as the enore WW produces in the 100 day period
This is why it "feels" the genie gives a lot less, but in "reality" they give a lot more.
I also love the other rewards from the wishing well outsode diamonds, those are also very well beefed up. loads of mana, seeds, 5 KP rewards and instants.