Scamming is bad, misleading people is bad, false promises are bad, any late night commercial with some gadgetry promising to remove your belly fat without any work for $29.95 through testimonials from professional bodybuilders that never used the product prior to putting their reputation on the backburner to sell a lie for money is the EPITOME of bad! (try to say that in one breath!) Lots of advertising is this kind of misleading information and false promise.
While there are some bad apples out there, this is not for you. Going to a Star Trek Convention and then selling collectibles to Trekkies (people who love Star Trek) is a win-win for everyone involved, and the kind of mindset you should start getting into. It's also a simple matter of supply and demand. As an Internet Marketer, instead of actually going to the convention, you may leverage eBay to your advantage. That's the Internet part. Getting the Trekkies to know about what you're selling, that's the marketing bit. Identify a niche, serve it well, and you will become valuable to others.