The problem isn't so much sales but the fact that most pure commission sales jobs are scams. Even if the product or service is legit, the company makes money by "pump and dumping" sales reps. Massive turnover is built into the business plan.
Credit card processing for example. They know that they're service has a market value to maybe 1 or 2 percent of existing customers nation wide. That's nowhere near enough critical mass for a sales rep to make a living, but plenty enough for the company to make a profit. So you come on thinking you're going to go out and kill it, burn up more gas than you make in commissions then quit in disgust. But the company now gets to reap the residual fees from all your sales (all six of them). Then they hire another desperate mope and do the same thing again.
Credit card processing for example. They know that they're service has a market value to maybe 1 or 2 percent of existing customers nation wide. That's nowhere near enough critical mass for a sales rep to make a living, but plenty enough for the company to make a profit. So you come on thinking you're going to go out and kill it, burn up more gas than you make in commissions then quit in disgust. But the company now gets to reap the residual fees from all your sales (all six of them). Then they hire another desperate mope and do the same thing again.