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You don't need 15. You might need 4. If you played the game properly instead of wasting time venting your spleen here you would have more than enough already from sugar track and other FREE sources. If you are unable to accept that gaining and using boosters (FREE!) is part of the game at the higher levels then by all means stop playing. You're in for a very long wait if you imagine that this level is going to be changed to suit you.