If you take your first experience: "My first crappy product made $8K a year in profit 0 advertisement" You might draw the conclusion that '0 advertising is no way to build a company'. In which case you'd have never bothered trying the others.
Adwords and SEO are extremely valuable and profitable when done well. Bear in mind that Bingo Card Creation is a relatively small niche. There are people doing finance related things with adwords who make millions.