And again, I disagree. I just explained the cost to see a movie. It's fair for me to say that movies are a reasonable form of entertainment. You can get cheaper, you can get more expensive, but it's your average level of entertainment.
If you want to talk averages, they're fairly easy to find. All movie tickets sold in 2013 total $10.9 billion. Spread across 315 million Americans, that comes out to $34.60 each annually.
So, the 2.6 person average family could spend their annual movie budget and get a PHB. Throw in popcorn and soda, they can afford an MM.
Granted, that assumes your 1.6 other household members are okay with not going to the theater all year so you can get said books. And, like all averages of this type, a lot of families spend far below the average.
As a bonus average, the average American household spends $118 on books every year.
And I think, for most people, it's really not. If you cannot afford the $100 this will be through Amazon, or $33 for just a PHB, or whatever digital offering they give you, then you probably are not a major part of their target audience anyway. If your standard is "free", then they really shouldn't care much about you, because they wouldn't stay in business if you were their target audience.
It's not that I have a problem with dropping a hundred dollars on RPG books. We easily do that in the GenCon exhibit hall every year on top of my Adventure Path subscription, which itself runs about as much as the revealed 5e product line.
But $150, even $100, isn't just going to magically appear in our budget. And 5e won't add hours to the day so we can play it. We can make room for either, but those have costs associated with them. We can't ignore basic economics, even for the sake of D&D.
There are certainly people who just have more money than things they want to spend it on; I've absolutely been there... and have the unused RPG books to prove it. But most people, including myself at the moment, have to make decisions about how they use their money.
Sometimes that means weighing three RPG books you might never use against tickets for the next ten exciting movies.
Cheers!
Kinak