I know a lot of people who share the same opinion. Never felt that way myself, though, prolly because I tend to see myself as a distant observer when reading - they aren't me, they'll never be me, so I don't feel any point in comparing things
I see. When I'm reading SoL, I'm not just a close observer; I'm also living their lives with them, experiencing their emotions, joys, sadness, and mundane things. At the core of it is a desire, I think.
For example, I'm in college right now. I'll never be able to attend high school again, no matter how much I'd like to. There's a desire here. And SoL provides the means to achieve so—not via some overreaching plot and character drama and development, but living through mundane reality. Although I'm not self-inserting or comparing our lives; I don't believe that's the point. Depression only hits when the stuff is over.