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Yes, there are up to nine tiers of each bonus. But you have to buy the upgrade from 6 to 9 tiers for each bonus separately for 10 Dozer Dollars each. The Dozer Dollars you can buy for cash or earn in-game by collecting puzzle pieces.

I think you can safely say the answer is no. There is no information on the internet to support an increase in stars at any level. From personal experience, I have played the game to a near 100 level and have had thousands of coins and the number of coins available to drop at one time has not changed.

There is no answer that sums it up, so here's my two-cents. The highest tier that you can achieve is nine. You can get these by spending ten Dozer Dollars to upgrade one category from six as the highest tier to nine as the highest tier. You earn Dozer Dollars by either buying them via. iTunes or earn ingame by collecting puzzle pieces to solve puzzles. ...

This was previously true, but has been modified during more recent updates. It's no longer the correct answer. I can confirm that the star counts do not increase beyond six and that there is no "reward unlocked" message for a seventh tier collection, leading me to believe that benefits do not increase beyond tier six.

It is possible on Android. These screenshots were taken this morning from my S3. When below 50 coins, only 4 stars are available: But when you have 50 or more coins, 5 stars are available: It may have been added in a recent update, but the Android version certainly can have 5 stars.