Don’t get too hung up on your domain name. You may think you have the “perfect” domain name. Not realizing you might get better CTR from a more appealing domain (and hard to know, short of testing, which is more appealing). And not realizing you might get better quality scores due to a domain better matching your main keywords.
For example, you may think your domain “JimsGreatBigOnlineStore.com” is perfect for selling model rockets (to give a random example). But people searching will respond more to something like “ModelRocketOnlineStore.com”, that corresponds to what you’re selling. And Google will give you higher quality for keywords with the words “model” and/or “rocket” (which are the most important keywords in that domain).
Oh, and you get more free traffic too, especially from Google!
For example, I threw together a blog under “ScottsdaleOnlineMarketing.com” (for the Scottsdale Arizona area).
I’m currently getting the top listing in Google for “Scottsdale online” and different variations.
Not big traffic. But it is outrageous to me that I could “own” that keyword for organic listings, by virtue of having the domain name and a little content.
Now I understand that you may have a domain name that is established, it give good branding, and/or you may already have affiliates under it.
That’s cool. I’m not saying you throw it away. But you can still have a different one that you use in AdWords, if you find a better one for AdWords purposes.