And also type in traffic.

http://inventory.overture.com <--- This is used to estimate the type in traffic of a domain.

Check the numbers for mortgage.com

14655 - to roghly estimate divide by 4 and multiple by 30.
110,000 visitors per month just by the name alone - no promotion needed. Now if I were to put up a page of just ad links (ppc ads). Those ads would actually pay $5 a click because mortgage seeking visitors are so $$$$. Think about that without promotion and thousands of ppl come to my site to click on $5 links. THATS A LOT OF MONEY IN THE NAME ITSELF.