I'm still waiting for domain valuations to eventually plummet, as it just doesn't seem that people navigate to sites that way. The only thing that it provides is lower barriers to come back for a second visit.
These days with so much spam, I try to avoid domain names with my search keyword in them.
There is some effect, but it's not that significant. Bing, on the other hand, seems to weight domain names very highly.
why? Simple..exact match bonus.
An exact match domain has a much MUCH easier time getting to the #1 spot in search results.
This is why creditcards.com outranks all of the big banks.
It may not "seem" that way, but our data suggests strongly otherwise.