Talking about the building prizes, I have placed all of them in my city. Sold some duplicates.
I value them as trophy not their true value per square. It's the process how to get them that I've enjoyed, that give them more value than any bought buildings. But of course it would be great if the trophy's true value also higher.
I started my city during the Winter Event, the only completed building set I could get. I failed for Valentine and Phoenix Rise building sets. Disappointed, yes but not toward the quests, but to myself for not better prepared.
Designs and concepts are first class to me. Quests are not perfect, but in overall they are good and challenging enough. I like the quests that help to quicken city development.
But I do really hate when I have to buy KP, those are my savings for bad days.
Also throwing resources and relics out in FA imo is really sick, it is the opposite of the true spirit of teamwork and care for others.
There are still many daily jobs in the city that can be explored and cooked as new quests. For example: Help your neighbor's or fellow's Main Hall 10 times, if they want us to finish the quest in the next day then make it 50 Main Halls
).