Finished all zoos (Mahjong Sanctury)

I can still replay all the levels if I want. I know that I am not getting new feathers for repeating levels.  But... I am playing the daily and getting feathers.  You have sometimes a new game that show up at the top of my zoo page. Like, Play 3 games and get feathers.  I play those and am not getting more feathers. It feels wrong that I cannot add to my feathers only by buying them.  If you have a game listed at the top, say ... get 20 feathers for doing such and such, you do that and do not get rewarded. But if you have not finished the whole zoo, you can play the same game and get the feathers.  So right now all I can do is the daily or BUY the feathers.