He let two of the worlds deadliest snakes bite him. Now Im wondering it those snakes had just been milked. But clearly there was a reaction. Seems to me that someone with some expertise in this matter needs to be investigating all this.
You should read about Bill Haast. He was doing that stuff years ago. Lived to 90+ and looked 20 years younger than he was. Was remarkably spry up till his death and they think it had something to do with all the antivenin he took over the years, plus all the venom he accidentally was exposed to through bites.
In an interview Haast said that he was bitten by a Green Mamba which he hadn't prepared for with antivenin shots and it almost killed him despite his immunity to almost every snake venom. He said he was paralyzed and couldn't move for days and when the nurse would move the sheet it felt like sandpaper rubbing the skin off.
Sounds like fun, huh?