What you're talking about is not equal though. You're talking about sharing the experience of an art, not learning the skill of it.
You can buy a painting and both you and your friend can look at it. You can buy a CD and both you and a friend can listen to it. You can buy a DVD and ... well, you get the idea.
But if you want to learn to paint things like the painting on the wall? You're going to pay for that, and so will your friend. You want to learn how to play guitar? Unless the teacher is not worried about money, you'll both have to pay to be taught. There's whole college courses for this stuff! You think a university is going to say, "Oh, well, I guess you both can just split tuition."
In your scenario, two people are getting the full benefit of a product, while the creator is only receiving half of the reward they agreed to, to release the product. Ever wonder why there's so much "blah" magic on the market? Even with good products, a lot of time they only share the basic concepts and none of the advanced work. This is why - because it's incredibly frustrating to put the work and effort into perfecting a routine or whatever, and then see it get stolen and shared around because people feel entitled to it. So if someone has been releasing material for a while, they start to only release stuff they won't care about seeing revealed on YouTube or on pirate sites, or hearing people talking about figuring it out from the trailer, etc.
So yes, I do think both you and your friend should pay the $120 unless you make a deal specifically with the creator. Anything else is, to a degree, theft of intellectual property.