There's money in them there dogs. I remember seeing a news segment about a guy who managed to build up a small chain of hot dog carts and was making bank. He came from almost nothing and built up a success finding a niche and automating and replicating his profit centers (sound familiar?).
Another guy from my hometown ran a restaurant and set up shop during fairs and festivals selling the same food under the same restaurant name. Then he did the math, and realized he made as much money off of the fair/festival food as he did on his standalone shop, only with 1/4th the work. So he closed the restaurant and just did fairs.
Another guy is worth about 8 mil from selling used tires and another 1.5 mil from a junkyard.
Sadly, there's also money selling "hope in a box" in so many niches, especially when the perceived barriers to entry are low (real estate, affiliate marketing). It doesn't happen without the right niche for a person, a lot of hard work and a little luck. No seminar can make it happen.