That's just factually false: to give a counter-example my company (~200 people) does exactly that (1 week sprints, though). Except that we don't sell "a produc

That's just factually false: to give a counter-example my company (~200 people) does exactly that (1 week sprints, though). Except that we don't sell "a product", we sell time. We'll do everything we can to help you getting a product out of this time, but if you can't, you were doomed from the beginning. It's just a different thing to sell for a salesperson, they have to adapt. But it works.