They are just as normal in their exhibitionism fetish as you (and the rest of us are) in our voyeurism fetish. Going straight into porn cheapens it (for lack of a better word).
Think about the reason you're even ON a voyeurism website. I'm not trying to speak for everyone, but I assume most of us are here because "porn" is boring, it's scripted and made for us to see. Voyeurism, on the other hand, gives that thrill of 'forbidden' captured moments, legally peeking through the window, while for the stars of RLC, it's the thrill of never knowing who is actually watching, "Are we public or private?", but with a safer method than actually going out in public and risking arrest.
Never claim someone's sexual preferences or fetishes aren't normal unless you're willing to hear others say the same about yours.