If you are the type to spend diamonds (whether purchased or earned in game) this is one of the better events to focus on what you need to improve your city
Particularly as it’s much easier to know the cost beforehand. You’ve got a guarantee built into this particular event.
Always 1 compass: (40/1)x9 = 360/20 per pack = 18 packs needed x 1,750 = 31,500 absolute max cost
Always 2 compass: (40/2)x9 = 180/20 per pack = 9 packs needed x 1,750 = 15,750 average expected cost
Always 3 compass: (40/3)x9 = 120/20 per pack = 6 packs needed x 1,750 = 10,500 absolute min cost
You also have a guarantee that each wheel has a max cost you can spend on that particular wheel. Someone might refresh it or get to Gold first, but you can’t spend more than the amount of prizes on the wheel before you get to know the result.
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Free to play
If we take the middle result that’s 20 Doubloons per upgrade needed. We get a lvl 3 from the Questline. 6x20 = 120 Doubloons needed without Mystery Chest. 5x20 = 100 Doubloons needed if you have the Mystery Chest.
102 Doubloons expected from event + incidents. So make sure you get all the login currency if you want a full building without diamonds
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St Paddies has the issue of time restraints. So if you’re spending you may be restricted in how many times you can actually complete each city in order to get the amount of buildings you want. You’d definitely be able to get additional buildings if you wanted, but the risk would be something comes up to interrupt you getting online when you need to advance the minicity or you miscalculate how many extra runs you can complete based on time restraints
Wildlife event is dependent on whether you can get the paws down. There’s no guarantee on how many moves it’ll take to find your first paw in any given minigame. There’s no guarantee how many paws per ticket you’ll find. It‘ll be a lucrative event for some and a dud for others. You may end up having to buy boosters to get the paws off the screen if you’re struggling to align the colours correctly. Cost to get additional buildings is going to be harder to calculate with all the variables at play. You could get a reasonable expectation of cost, but any number of things could result in that cost being inaccurate