For me, it was realizing that little most readers said came to pass, and even for the small things that did, it wasn't worth all the money I spent and the heartache I went though.
When I first started getting readings, I believed them with all my heart..now, when I get a reading, I find myself saying "yea right" more than not.
Now, it's more a source of entertainment if I get one..and again, I've slowed down considerably since when I first started.