It took me 10 months to save up 19 Gold Nuggets. I got the Jousting Arena Renovations goal (after leveling my arena to max level with coins) that requires the gold piping - I managed to make 4 after getting a nugget drop a few days ago. Since then, I now need 12 of the dang things:
Equestrian Race Event - 2 (level Jeweler to 5)
Jousting Arena Renovations - 5 (gold piping)
Discover Adamant - 5
Seriously S8?!?! These are a pretty rare drop, at least for me and you're requiring them out of the wazoo. To have them as a requirement in concurrent goals is outrageous.
I suppose it's because you want us to use gems to either skip the goals or pay for the nuggets we don't have and therefore buy gems using real world cash. Guess what? These goals will sit in the list until such time as I manage to get the drops. I have never and will never pay cash to complete any goal in any game.
If you're going to make them a requirement in so many goals, the drop rate needs to be increased. Or at least let us substitute Gold Eggs or Gold Apples (whichever we happen to have an abundance of) since gold is gold and form doesn't really matter when melting the gold down to make something (in the real world).