Whether you like it or not, many people like Crucial.com, and we have no problem whatsoever with users of our site recommending Crucial.com, as long as:
- the answers consist of more than just a link and are valuable even if the link may break
- the users are not affiliated to the site
Crucial.com may even buy advertising space here. The only thing that wouldn't be allowed is them using fake accounts to promote their site, something that we would indeed consider as spam—but it not occurred yet.