Never offer more than one auto-submit program from the same web page or ezine. Never offer two brands of the same dietary supplement from the same web page or ezine. You will only confuse your visitors and probably not make a sale. Unfortunately credibility is a really rare online. Many of these dishonest businesses have learned to exploit the anonymity the Internet offers.
Some people hide behind a false name and offer no contact information.
Some of these people have no problem taking your money and running with it. They are often nearly impossible to track down. Or at least the cost of tracking them down is more than the amount lost would afford. My best advice is to stay away from Internet malls in general, these are catching a lot of flack almost everywhere. I believe the ideas above are good advice for anyone involved in, or starting in, Internet marketing.