I get it, but it doesn't apply here, because passing his buddy's details on to people here isn't "passing a favour forward" - it's presuming that a friend, who did him a personal favour, will also be willing to do that favour for fifty strangers off the internet. It's not passing a favour forward, it's passing a burden back to the friend. No favours are being passed or repayed by him giving out his mate's details. He was right not to presume upon his friend's good nature.
Fair point on the assumption thing. I wouldn't do that either if it was a friend. No harm in saying which shop it is though so that the guy can at least ask (again, only if it's a sales rep, not a friend).
You picking your iPad 2 up from Apple store or AT Computers? Methinks AT has a smaller queue (smaller stock though probably too!).