What is the highest score on any level on Candy Crush Saga?

That is not necessarily true @mercerik.  Not everyone who gets the weekly race gets the rewards.  That is why you will see several messages posted in the community asking why they didn't get the rewards.  It's in a testing phase right now so players were randomly chosen to test it and only those people are getting the rewards.  I don't know if and when the test will be done and if it will be offered to everyone but for now it's only the testers who are getting this.

Better than waiting for that reward is the Sugar Drop challenge and I will post the links here just in case anyone here doesn't know anything about it.  You can get up to 13 free boosters (which includes gold bars) every 8 hours.  Read more about it here:

https://community.king.com/en/candy-crush-saga/discussion/250570/superstar-information-post-have-you-ever-tried-the-sugar-drop-challenge

And here is a list of the best sugar drop levels

https://community.king.com/en/candy-crush-saga/discussion/252067/superstar-information-post-best-levels-for-the-sugar-drop-challenge#latest