Can I get Genius Bar Support w/o Applecare/Warranty?
Yes, you can. Without AppleCare, advice is free; quotes for repairs are free, but the actual repairs are not.

With AppleCare, you're covered for pretty much any repair, except when caused by you: e.g. LCD backlight fails? Repaired free. Dropped your MacBook and broke the screen? Not covered. You pay.