I discovered this thread when I was already level 17 or 19, to late for the Athlete Dragon-trick, so I got that ugly one much later, but followed the rest of the instructions, worked just fine. I harvest coins every time my phone gets a push notification, I'm Level 101 now and have 112.000.000 coins. Most enjoyable, I don't have to max some high earning dragon, if it looks better in its earlier states.