But I moved my domains away about a week ago. No discount is worth supporting GoDaddy.
That's when I discovered that if you call Network Solutions in person, and tell them you're leaving for a cheaper registrar, they'll match the price. I kept my dozen or so domains there, and now have a locked-in price of $9/year with Network Solutions.
I still feel some loyalty to them from the early days when they were the only registrar. For some reason, I felt like they were more credible. I know they've actually got their own skeletons in the closet, but old habits die hard.
I hope this list is complete:
1) Cheap beats a lot of things.
2) They give you minimal trouble if you only use their registration services (I hear that their other offerings are terrible).
3) Popular and well known also attracts people -- "I need a domain name, hmm, this company sounds familiar, and almost everyone else is using it".
4) Domain registration is not something you're going to thoroughly evaluate. It's a 5 min process that doesn't cost that much anyway.
5) A hacker guy feels "clever" when he can navigate through all their extra offerings, specials, trap checkboxes etc and just order what he needs, like he somehow "beat the system".
6) Popular and hugely successful means they are going to stick around. People have been burned by web hosting/registrars/similar services that closed business after a while.