About the recurring charge for the site they joined...
-Yep, they send it after the transaction but 1 phone call or email stating you dont want this membership anymore and you are credited... but these sites I am talking about you will be lucky to get in touch with their billing support and if you do after going back and forth many many times, you will be told that your info is being added to a blacklist and you will never be able to join any adult website again...
But goodluck receiving a credit from them.
-About the language tours, my sites dont have that problem
Anyways, someone who joins a site then gets a bill for $200+ and all the other crap they will go thru... they definetly will never join a site again.
Once some affiliates do join some of these sites themselves and end up getting screwed even knowing what not to do, they will definetly not want to send their bookmarkers there.