There have been a lot of wrestlers that have died too young, but unfortunately, that's sort of the nature of the business to an extent. When you have wrestlers out there who are engaging in death-defying moves hundreds of nights of the year, yeah, that's going to take a toll on anyone. Mistakes happen and wrestlers get injured, sometimes fatally. Others will get injuries that will last them the rest of their lives. And today's crowd relies more heavily on risky, visually appealing moves than the slower-moving 80's. But yeah, wrestling definitely should be scrutinized more. The McMahons, who have owned and run the WWE for decades, are obviously heartless individuals who are dead set against any union being formed. Linda wasted 100 million dollars on 2 failed U.S. Senate bids (money that she earned while her employees were doing back-breaking work...literally). Karma totally needs to catch up with them.
Porn is more of a mystery. A large handful of the performers I have followed have died, although the circumstances range from homicide to unknown to injuries they didn't recover from. Probably a few drug overdoses. I don't know of any that have regretted their porn work -- that's not to say they haven't, I just don't know of it. Kyle Dean once said that outside of losing a few friends (which he really didn't care about), porn really didn't make his life worse. Some porn stars are on drugs, which are mind-altering substances, and that can definitely fuck up a person's brain.
Nobody knows what models make, outside of the models themselves. I'm sure some make more than others, it probably depends on several factors: what studio they work for, what they're willing to do, etc.