A few interesting points:
- DropBox probably spent millions of dollars marketing their product, that they didn't own the domain for (or the trademarks, apparently).
- DropBox had to go to court to get the domain.
- According to DomainTools.com, the domain has been registered for at least 6 years, and been dropped a couple of times during that period. DropBox hasn't had the Trademark for that long...
- The owner of the domain foolishly advertised competitive products. That's probably what got him in hot water. Would have been better to make a deal...
Happy Domain Hunting!