I am a friend of Karla. Here is a quick post to clarify a few things.
As you already know Karla left the sexy-modeling work. She (now) regrets having done it as it makes it more difficult to find mainstream work in terms of acting or regular advertising modeling.
From what she says, the guys that made the real money from the sites are the webmaster and the photographer. Though she made decent money by local standards, she later found that the photographer (who was the one handling everything with the foreign website owners) paid her about 20% of what he collected. She parted in bad terms with the photographer and has not made any money related to the Karla Spice websites. She was paid a fixed amount for the shoots and in no way had any income based on memberships collections (IMO, she was way too stupid ... but well, she was young and at the time was happy with what she was earning).
From what I am told the photographer got her to start working when she was underage (younger than 18) and they together used fake IDs to fill the needed forms to comply with US law. In case you wonder why I say "from what I am told" is because I didn't know her at that time.
She is trying to move on and distance herself from her Karla Spice past. I reckon that this will be quite difficult. Anyway, for this reason she would like that all discussion pertaining to Karla Spice would not mention her post-Karla-Spice life (like mentioning details of where she is actually working now and her other name). This again, I reckon is very tough; after all, this is the Internet where everything is discussed and everything comes out. She will even probably get upset with me for making this post if she finds out.