Blogging for Free
Quite simply, the plaintiffs offered a service and the defendants offered exposure in return, and the transaction occurred exactly as advertised. The defendants followed through on their end of the agreed-upon bargain. That the defendants ultimately profited more than the plaintiffs might have expected does not give the plaintiffs a right to change retroactively their clear, up-front agreement.
— U.S. District Judge John Koeltl, in his decision against the unpaid bloggers who sued the Huffington Post for retroactive payment despite the fact that their original agreement was to write for free