Before you cry about bad luck: first step in this game is to max your followers. If you play often, that will cost you nothing as you get way more diamonds from them that their actual cost. (2 games in casino give for free, helicopters, weed farm, jobs, family challenges... diamonds are everywhere)
This game is not badat all :) Once you get 4 clocks, go for 100 followers. It increases your luck and if you lay some hours a day, you will gain MUCH more diamonds in game that the cost of the followers.
The rating of this game does not reflect the improvements they made across the time. The quality of the cue you have is not so important regarding to the skills you develop.