So, has anyone thought about how Portal is a giant allusion to Purgatory?
There is (seemingly) no reason to be putting Chell through these horrible experiments other than for GLaDOS' sadistic pleasure.
But what if it's REALLY a test?
Not a scientific test, but a test of character and determination as to redeem oneself? Perhaps GLaDOS' taunts of "All your other friends couldn't come either, because you don't have any other friends because of how unlikable you are. It says so right here in your personnel file; 'Unlikable. Liked by no one. A bitter, unlikable loner whose passing shall not be mourned.'.... It also says you were adopted. So that's funny too." isn't just pointless mocking, but a reminder of Chell's former life?
It's also heavily implied that GLaDOS could possibly be much more knowing, being as some kind of tester for Purgatory, with quotes like "Speaking of curiosity, you're curious about what happens after you die, right? Guess what? I know."
Quotes like this have a much more significant meaning when thought of in this context.
"I feel sorry for you, really, because you're not even in the right place."
"This is your fault. It didn't have to be like this."
"You're not a good person, you know that, right? Good people don't end up here."