Nah that's not it @Spinnifix i am sure of that, i am at level 2570, i once lost all my boosters I've collected...the game gets harder especially if you loose on your first attempt.. some easy levels are bad ass take note.
I wish King would reward players who are further in the game with more gold... I am at level 2500, and those levels are hard. Come on make it ten, five and three.