In case anyone actually wants to know a couple of reasons
A) It's not fair that some people pay and some don't. (Of course it's also not fair that some can afford $70 on a video game and some struggle to buy food)
B) If everyone would pay then we'd all only have to pay $50 each, lowering the price for those that are paying $70 at the moment. (Whether developers would lower prices or just make more money is another question)