hmm so the Valve CyberCafe program ended long ago but this is a different approach.

From http://store.steampowered.com/subscriber_agreement/

Quote:Your Account, including any information pertaining to it (e.g.: contact information, billing information, Account history and Subscriptions, etc.), is strictly personal. You may therefore not sell or charge others for the right to use your Account, or otherwise transfer your Account, nor may you sell, charge others for the right to use, or transfer any Subscriptions other than if and as expressly permitted by this Agreement (including any Subscription Terms or Rules of Use) or as otherwise specifically permitted by Valve

You're supposed to encourage your customers to purchase the game on their own steam account imho.