[etccarmageddon]

if 5% of the users are using more than half the network then I'd suspect that any higher tiers or additional GB bolt ons for these power users could reflect this and thus be very expensive or at least an opportunity to exploit this 'fact'!

if the 5% are using 67% of the network then they are the least profitable or loss making customers.

if these 5% are forced out by the new tiers then that (in theory) saves tons of money from the 67% of the network then freed up... which means more profits and instant free capacity for more light users to be shoved onto the network without expanding it.

assuming this 5% are using 10 times what the majority are then that means the 50,000 high users who leave can make space for 1/2 a million light users without any network expansion program.