Looking for anecdotal examples of the following:

If you put N number of individual DHCP client residential broadband customers behind cgnat for ipv4, what percent of customers contact support and become a support/troubleshooting case later.

And what percent of customers have a significant problem with it, to the extent that they either need to be offered a $5-10/mo extra /32 dedicated real address, or possibly cancel?

Hopefully on sample sizes of 5000 or more. 

All else assuming that the customers are also dual stack v4/v6 and can reach v6 things normally without any of that traffic going through the cgnat.