Domains with the word "buy" in them

What's your experience with these type of domains both for resale value AND for seo ranking for that specific phrase. I know personally, when I am looking to buy something I always type in "buy macbook pro" or "buy <anything>" into Google so naturally, ranking a domain on the first page for that phrase and using amazon affiliates, etc. sounds like a good idea, but am I missing something?

Does Google have something against these type of domain names for ranking purposes?

I don't think there should be a problem. I don't have personal experience with them but sounds like a great idea.