Yeah, it's crazy! Or what if, when you paid for a gym membership, they wouldn't let you lend your gym membership card to someone else so they could get in too?

Yeah, it's crazy! Or what if, when you paid for a gym membership, they wouldn't let you lend your gym membership card to someone else so they could get in too? Or if you buy a parking permit for my car and they won't let you shift it to someone else's car when you're away? Or if you go to a buffet and get "all you can eat" and they won't let you give your food to three friends? Oh wait, they already do that. In fact, pretty much any time you pay a membership fee for a "use this as much as you like" service, it's impossible and/or illegal to share your membership with other people. It's just common sense -- "all you can eat for a fixed price" business plans only work if you don't share.