Would granting an addictive item in exchange for perfect attendance and behavior work for troubled students?

Like:

Do you homework get an extra hour of internet?
Get honors then get your driver’s license earlier?

Dr. Phil said that the higher his children’s grades the better life style for them.

Get a “c” then live a “c” lifestyle.
Get a “b” then live a “b” lifestyle.
Get an “a” then live an “a” lifestyle.

What else would work on children?