Domain names themselves are a loss leader for registrars. They make money by upselling customers on hosting, email, certificates, analytics etc. So if you are just paying a couple dollars a year for a domain name and nothing else, your profile doesn't really matter. You are in the lowest tier of customers.
> Domain names themselves are a loss leader for registrars.
Doubtful. Registrars have almost no costs - any markup over the registry fees is almost pure profit.
It still matters who your customer is if your mistreatment of them drags your own brand name through the mud in a front page Hacker News story.