Edit: I pay for netflix, I pay for amazon prime, and I'm a member of a really good tv piracy site. My wife is happy with the TV access we have. My thing is video games so I don't actually care about TV.
I'm fairly certain, without adding it all up, that at $60 we'd save money just buying/library-ing/redboxing, $40's just where I'd start to go "hm, better run the numbers" and there's a chance it'd work out against paying for streaming, so I'd call it a decent upper bound on what I'd probably be willing to pay for such a thing. Hell, I'm paying almost that now, but the fact that I can still only find maybe 1/3 of what I want to watch available on my three services is why Amazon's set not to renew next year and Netflix is on the chopping block soon (3rd service is a cheap, niche one with mostly anime, b-movies, and some original web animation stuff, sticking with it pretty much just because it's cheap).
I click it. It takes me to Amazon, where I am already logged in. I can watch the trailer or "buy" (digital purchase, so "long term rental") it for $20(!). There's no indication I can stream it with Prime. Even knowing it's available I can't figure out how to do it from this screen—I'd have to just search again on Amazon and hope for the best.
Video 'rentals' are grossly overpriced. I've never rented anything from Prime, and their prices would have to drop to about 10% for me to feel like I'm getting value. I think ~$0.25/hr would be fair.
Media companies are resistant to discounting the cost of discrete pieces of content despite the supply of entertaining free video exploding a thousand fold in the past decade.