Iguanas really became mainstream a while back. Long before I ever got into herps I knew people who had iguanas. They were "cool" to own. People told me they were great pets...easy to own, friendly, dont even need to be caged. It's no wonder there are so many in rescues.
I dont think any large snake or large lizard has had that kind of popularity. I think more of the people who buy snakes (especially smaller ones with less "coolness" factor) are serious about the hobby. I mean, who'd pay pay thousands for an albino ball python that only grows to 5 feet when they could get a normal burmese python for less then 100 that grows to 15 feet or more? Someone serious about ball pythons, that's who.
1 adult bull snake: "Dozer"; 1.1 juvenile bull snakes: Oscar and Phoebe; 3 baby red-sided garters; 1.1 macklot's pythons