The idiomatic expression "to earn extra points" means to do something that will gain you recognition, appreciation or rewards beyond what is expected or required. Full definition
You'll also earn extra points for goods and services attached to your accommodation and on your total bill with the hotel. (upgradedpoints.com)
In that there are now four opportunities to earn extra points on certain stays. (thepointsguy.com)
Rewards programs may also offer opportunities for earning extra points with participating car rental services, hotels, and airlines. (thesimpledollar.com)