The Investigative, research or people search websites are consistent online scams. They not only provide little to no service, but manage to obtain money from your credit card(s) The information that these companies or entities provide are public records. Addresses, weddings, death, home purchases etc., Try running one on yourself! It will give you an idea of the fraud and scam involved.
Sadly, if there is a buck to be made, scammers and crooks lurk right behind. Like P.T. Barnum (Circus Mogul) said, "There's a Sucker Born every minute!"