Power broker

The NYT just wrote an article about people who are fighting over power outlets in airports and cafes. Although the incremental price of power for any one user is negligible would it make sense to build some hardware/software that airports/cafes can buy that will
1. expand the number of outlets
2. allow them to monitor how much each user is using
3. charge them for use
4. provide the finance management to enable a rebate to the property site operator

Would the money involved to do this be worth it?