But even now, you just stated the goal is selling a product, something the salesperson cannot provide on their own. And it's hardly the only means of funding th

But even now, you just stated the goal is selling a product, something the salesperson cannot provide on their own. And it's hardly the only means of funding the initial development. Selling promises about a future product isn't the only aspect of "ensuring I get a paycheck", at least not for very long. The sales/product delivery equation obviously balances back towards the 'doers' after that initial development phase or salespeople would be perpetually selling themselves out of a job.