Bought coins & wheel spins & raffle coins don't count towards Leaderboard, these coins are simply the fodder with which to make bets on coin games. No coins = no coin games. So if you can't earn lots of coins by winning games (ie: get on the Leaderboard by skill through winning coin games) and you opt to p2w, then you need to buy coins in order to fund your coin games.
GiantFrog just made the post of the year ...
This may sound like a waste of money, but you would get an amazing shiny trophy to your profile which shall forever remind you of how dumb you are.