Collateral Lesson 1: Peering with Customers is Good (2)
Thus by peering with 10% of your customers, you increase the bandwidth you have to sell to customers 0.1% of the time. In exchange, you either sacrifice payment for 0.001% of your traffic or need to create a new billing method for it. These numbers are both insignificant.
What’s important is that it allows you to have a uniform peering policy without having to special-case an exception class.