Why? In this event the number of symbols you need to get the rewards is high, even when you are on the lowest tier. But if you want to end this event with more spins than the number you started with you need to focus on three symbols in a row. That’s why you get a lot more single and double symbols. Of course the chance to get one symbol is the highest and three symbols in a row is lowest. The best strategy to play and win all symbol events Collecting these points got you rewards like coins, spins, xp and chests. For one symbol you got the lowest points (one or two), for two you got a slightly better reward (three of four points) and for three symbols on a row you got the biggest reward (ten or twelve points).
These symbol events in the past had strawberries or more recently candy sticks. Sometimes in Coin Master you have events in which you only get rewarded for having one, two or three symbols on a row.
