I think the developers should revise the cost of group goals where you need to serve the same recipe 10x to get a reward of 6 gold. Instead of putting in 2 gold, it should be 60 hearts instead. Technically since you put in 2 gold and get back 6 gold, your reward is only 4 gold but you have to serve a recipe 10 times, which means having to use that same boost at least 5 times (assuming you are able to serve the recipe twice per play). Compare this to the group goals for serving a recipe only 6 times (at least 3 times using the same boost) to get 3 gold at a cost of 20 hearts.
So in one case you have to use minimum 5 of the same boosts to get only 4 gold, yet in the other case you use only minimum of 3 boosts to get 3 gold, although you spend 20 hearts to do so. So for me, the time I have to wait to prep 3 hour recipes due to using them all up in a serve 10 group goal isn't worth getting only 4 gold, when I can otherwise spend only 3 boosts to get 3 gold. This is probably also why most players refuse to join Serve 10 goals requiring 3 hour recipe boosts, and mostly only join serve 10 Laguna Burger goals or the other shorter prep time goals. Now if the cost of Serve 10 goals were 60 hearts instead of 2 gold, then the reward would actually be 6 gold and make it more worth it.
The downside of my suggestion though is that 60 hearts is still 3 times more hearts than what I would spend for a Serve 6 goal. So if my suggestion was implemented, we'd spend 60 hearts to get 6 gold in a Serve 10 goal, as opposed to spending only 20 hearts to get 3 gold in a Serve 6 goal.
Either way, I still see Serve 6 goals as being more worth it than Serve 10 goals. Especially since the game is still very buggy and sometimes when I'm not connected to the same wifi, my goal disappears halfway through while waiting for my recipes to prep. So I waste 2 gold as I'm unable to complete the Serve 10 goal coz of the stupid bugs of the game.
All in all, you guys should think of a way to make Serve 10 goals more worth our time and effort, in addition to fixing the disappearing goal bug.