I had never heard of this. I would have done this back in the day.
Instantcreditbuilders.com, or ICB, helped Estruch boost his score by arranging for him to be added as an authorized user on several credit cards of people with stellar credit who were paid to allow this coattailing. Parents also use this practice when they add their children to their credit cards to help them build solid credit.
http://news.yahoo.com/s/ap/20070603/ap_on_bi_ge/cash_for_credit;_ylt=AkKULB04mFCWlNVK26PDFrGyBhIF
