[chaz6]

But if I am using my own domain, what difference does it make if it is more "valuable"?

Sadly the lack of IPv6 is a deal breaker for me.

[koselig]

Oh I think there's some confusion here: for your own domains it doesn't cost anything extra, so go nuts with addresses.

Purelymail also has some domains you can use like I can get "[e-mail]" and then I'm charged in the 7 letters tier for it.

At least that's how it's been for me as a happy user of PM for the past year and a half.