I agree, I came to the comment section to say I think this article takes the wrong approach entirely. You have to test your market with different products and

I agree, I came to the comment section to say I think this article takes the wrong approach entirely. You have to test your market with different products and different price points. If you make three widgets, offer them for $1x, $5x, and $10x. If you sell all three you know you are still too cheap. Make your next batch even more expensive until you find a price that people are not willing to pay. If your products don't sell, you need to either lower all your prices, or improve your marketing.