I think most of this advise is very arbitrary. There are a million ways to make money. Choosing a small market vs. large market is not inherently better, target

I think most of this advise is very arbitrary. There are a million ways to make money. Choosing a small market vs. large market is not inherently better, targeting businesses is not inherently easier, and finding one customer who pays 10k€ is not necessarily easier than finding a 1000 customers who pay 10€. It's just different. There are one person companies that are successful with either choices, and the decision which opportunities to pursue should depend on your talents, your personality, your experience. For example, I personally find it much easier to sell a cheap app to lots of people. I suck at selling big contracts to businesses. I only once managed to close a five figure contract, and that was a consulting job where I was basically an employee. But I'm not saying everyone should do the same. Figure out what you are good at, and do that.