Considering the continued success she has I'm sure she disagrees. She found her niche and ran with it like nobody has before. I have a feeling when she finally quits it will be because she just feels like it.
Most people in the industry from soft adult models to full blown pornstars would kill to have the success she has had. They just can't make it work. Yes, a good bit of that is luck, but part of that is they just don't have what it takes. When you consider for the most part she didn't even have to get fully nude to have it it's pretty damn impressive.