What are the factors that make a domain valuable?

[bypass]

What are the factors that make a domain name valuable?

[eHostSpace]

- how rare is the name (meaning how many thousnads have been pinning on that domain name but you somehow got it - eg: yahoo.com)
- how "nameful" it is (meaning how the name can tell people of what the website is about at one go, eg: www.webhosting.com would be gd for a webhosting company)