Earlier quoted context omitted.
Sorry, I just don't agree. 120k barely makes expenses for 1 FTE. Not only that, but it's also an amount of money that a strong freelancer can generate on top of living expenses in a particularly well-utilized year.
You're simply empirically wrong [about the 'amount' of money that represents, whether it is large enough to make a substantial difference], and your anchors[1] are not only irrelevant and misleading in an early-stage context, but extremely toxic.[2] What was Google's first check in the amount of? $100K. It was a ton of money. As Wikipedia points out, "The first funding for Google as a company was secured in August 19…
The skills to get that big company job or land those consulting clients are pretty much the same skills you need to make your product company successful. An understanding of what people will pay you money for. Ability to execute on a project. Collaboration and communication. And of course, solid coding skills. The difference is that a product company also requires a fair degree of business strategy, determination, and sheer resourcefulness that you don't need to get a job.
So if you want to found a successful company, you're much better off developing those skills, testing them by getting a job or someone else to pay you money, and then striking off on your own. If you just get the money, chances are you will lose the money pretty soon too.