Obviously, such interviews are largely controlled by JT himself so it would be hard to be sure if what the girls say is what they themselves think, or what JT instructed them to say. You cannot expect the girls to discuss finance either in such a setting.
That said, most interviews don't sound rehearsed, and a lot of girls do say they enjoy it for the excitement, in some cases the girls' boyfriend even get off on seeing their girlfriends getting creamed (e.g., Cissie, Annette). And Betty said that she needed the kick of the shoots.
Others, e.g. Karo (Sperma Marathon) have said that they were just looking for new experiences.
There used to be a GGG-forum (the url now redirects to a paysite) where, in reaction to my request for more information on Alesia/Claudia/Connie, someone claimed to have the information that she was a ballet dancer from St Petersburg who occasionally traveled to Munich twice to make some extra money to help her family. I don't know where this information came from, in all the movies I've seen her in she never utters a word.
Tima, an early GGG girl, has a Quicktime interview (in English) up at her website. WARNING: the website focuses on scat, so beware.
Bea, a recent GGG/666 girl, also worked for Simon Thaur of Kitkat/Subway (as "Schnuckel Bea). In one of Thaur's movies she is interviewed, and gives her motive as "dirty things have always appealed to me".


