Electronic rust control module. Science or Scam?

I work for a new car dealer. Don't buy into this kind of crap. Same goes with the "premium paint sealant", you pay the dealer $400 to have a couple kids wipe on a product that you can buy yourself for $20.

A better use of your money would be to send me $300 and in return, every month I will send you an email reassuring you that everything is OK.