Sure you could, but that would only result in a 1x slingshot multiplier…..have a read of the other thread where Hank and then later me (on page 2 or 3) try to explain that: http://www.angrybirdsnest.com/forums/topic/spending-pearls-to-buy-hats-and-upgrade-slingshot/
Basically you have a bird level (14 is the current max) + Hat multiplier + slingshot multiplier…..the slingshot multiplier is determined by the amount of complete hat sets so 1 complete set is x1, 2 complete sets is x2, etc to 4 complete sets being x4.
