While I’m a huge fan of NameJet, Go Daddy, Sedo, Uniregistry and many of the other popular domain marketplaces, it is important to remember that they sell a ton of names and researching each one to determine if it violates a Trademark (even algorithmically) isn’t going to happen. Couple this with the fact that UDRPs have become a new path for people to acquire domains given how easy it is to abuse, trademarks or not, and it means that as a buyer you really need to do your homework before buying a domain name.