Like I had said there is contrutive feedback here, for those give it without sounding gripy props to you, you know who you are.
Again like I said, since they have mentioned that these challenges take into account aspects of your particular city, of course some things are going to be ridiculously high to make it a challenge.
The part about the Tavern Challenges, I assume you have a fully upgraded Tavern? If so the full table collection is 1355 silver, which includes the Golden tray. Most players with a full Tavern are going to have 70-140 friends, meaning you would need 2 collections of 16 players and 1 with 11 sitting to complete the challenge. Then you have silver from sitting in other players Tavern as a bonus. Even with 80 players on your list, a throne room floor, and only being able to sit at 50% of your friends tavern's, you would get approx 240 silver just from sitting in taverns. (Note a full 140 list and sitting in every Tavern is 840 silver going by the odds they give us)
So yes it is indeed possible to do day after day. I myself spend 2k silver everyday in my main world. I have 104 friends, and I know I need to remove inactives. I can probably sit in ~60 taverns on any givin day depending on if they clear their seats often. I collect my silver often before it fills, sometime at only half full. And yet I still have a growth rate of ~1000 silver/day (most likely more, because I didn't factor in using the lowest GE boost between 2-3 times a week)
As for Production buildings like terrace farms, contrary to popular belief not everyone will use the fp option everyday. Yes free fps are great, but some players might be wanting free goods as well, especially in particular ages where goods can be harder to come by depending on your play style. (Even factoring in the size of TF, You cant argue that 10 free refined goods is something players might need) And even more, some players might use a field of Bazaar's in bizarre fashion(
) and use the 1 hour production during the day to boost their Guilds Level, and taking the Refined goods production overnight. Sure a high Age HoF motivated would offer more Power for the space used per day, but maybe thats all the guild has a collective and the player is less concerned with 2fp a day progression for themselves and wanting the rest of the guild to be able to get an extra fp a day. (It's call teamwork
). Try not to assume what every player is going to use special production buildings for.
That being said, they are labeled as a production building so would most likely be factored into that equation regardless the fact it's a Bazaar or TF or whatever else. You as a player would have to choose between what you normally use it for, taking a loss that day (or week) or to change it up and get the grand prize at the end. And since the majority of players sit in ages now it's not like it would really hurt your progress by choosing something out of the norm if you really want to try and take the challenge for a chance at a prize you normally cannot win every week or even every seasonal event.