It isn't more accessible for one simple reason: The schematic is Steve Weber's intellectual property. He worked hard at it, spent his time and money to develop it. It isn't free for the taking. He should be the one getting paid for his efforts. Copying the design is stealing, the same way you would steal it in a store. Some people are certainly going to get inspired from his schematics and come up with neat stuff, but that is different. It requires knowledge and efforts, and it helps develop better systems. We all get inspiration from somewhere. However, outright copying is theft, pure and simple. Imagine if you knew someone was going to copy the design you spend a year developing, hoping to pay a few late bills with the profits, and some guy released files of the copied PCB.. Right.. That's why the MTR files are not free to download. If Steve would have known for instance that someone would copy his design (which might still happen) and he would lose a big chunk of his profits, he might have decided to not bother design the next model, and that would be a real loss to all of us.
Gil.