I only pay for two .ca domain names, I originally was not self hosting when I got the first one so it is rather expensive as I use a different email address for every service/site I sign up for. I get next to no spam. The next domain I have as a test domain, I will be using it to test out things before I commit to them being on my main domain.

The first domain is something expensive, as they are currently doing all the hosting, the second one was something like $11 or $12. Once I get my test setup running I will move my main one over to my self hosted system.