19 year old Kendra Sunderland filmed her own sex tape in the Oregon State University library for which she was arrested and charged for indecency. On the plus side, the incident made her famous and now she even has her own website (NSFW) PlayWithKendra.com where she does almost anything anyone asks her to do including smelling her own armpits.
Screenshots from her sex tape in library.
Her business model ist offering a "service" via her web-site.
This so called "sex tape" and the other "selfies" are her advertisements, which are cheap and have a hughe impact.
So from a business point of view, everything works pretty fine.