So looking at the cost to complete the rivals quests... I will use town 2 as a base (that's what I used in-game), and add all
additional costs beyond the standard town strategy following my town 2 guide.
Upgrading all the managers will cost an additional 2120 pots. However, if we use the 3 Quick Promotions we get on the most expensive managers (last Drinks + 2 last Fireworks), we can cut that in more than half for an additional 970 pots.
For the time skips, need 7x400 + 2x700 + 1x1200 = 5400 pots. Again we can use 3 Time Warps to save 3x400, for a total of 4200.
We get 200 pots back from quests.
Total cost: 970 + 4200 - 200 =
4970 additional pots of gold.
That's almost half of all the pots of gold you get through the event. You probably have enough pots of gold to
waste on 1 rival challenge, but definitely not more. And for what? The rewards are not worth it at all, you can get a ton of cool stuff from after town chests for 5k pots.
So currently my recommendation for the 4 questlines is as follows:
- A: Complete first 3 quests
- B: Complete as many as you want - not relevant for event
- C: Complete as many as you want - not relevant for event
- D: Complete first quest, or first 4 quests with 2 Time Warps for quest 2.