I was tired of constant questions from students and parents requesting bonus opportunities...tired of students needing to leave class to get something from lockers or needing a bathroom trip because she socialized during class transition time instead...and so I have found a system that works in my classroom and takes care of a lot of problems.
Students get 25 bonus points at the beginning of each quarter. Everyone is happy. I'm not a big fan of bonus points, but 25 points in my class means an overall jump of 3-4% points, and I can live with that.
Students don't ask to leave the room often because it "costs" them. Teacher is happy!