Originally Posted by TomekSzymek
In my opinion, it doesn't have sense. For example, there was a mission to collect or spend, let's say, 5000 coins. Instead of this we can skip this for 1500 and get the same award.
This makes a lot of sense to me. When you collect coins, you have more of them. Skipping the mission reduce the number of coins you have. When you spend coins, you can use them on something useful, like an upgrade. Skipping the mission makes you spend 1500 coins for nothing besides completing a mission.