To pick up on that, presumably the "our way or the highway" is a business strategy. In other words, you have huge buying power in one product, allowing you to price your projects more competitively than you would otherwise. Is that the reason for it?

I think it's more than that. The mindset typically starts at the front end. What's the easiest and best way to specialize from appointment generation through installation? Having three or four different kinds of siding is very difficult. It's less so for appointment generation, which probably makes it easier. But for sales, it's hard to be an expert and walk homeowners through why a specific product is best for them.