Registrars and hosting companies like to sell through resellers because it's easier for them to collect money through resellers. That's why they give us discounts.

If website owners change their email address, the yearly or two-yearly invoice from the registrar may not reach the owner who may then lose the domain name through not renewing it on time.

We don't let a website owner forget to renew their domain name or hosting. Registrars and hosting companies may have tens of thousands of accounts and so cannot provide the same personal service that we can.