I don't believe some people were tricked but we're a victim of their own success. Take Alan Moore and Watchman for example. He signed the deal that he would get the rights to the book back once it went out of print as that's how the industry model worked at the time. The book was so popular that it's stayed in print for the last 40 odd years, so the rights didn't revert. Maybe DC should have renegotiated things in light of that, but I see that he and they went into the deal on good faith based on industry realities at the time.