I use to work for Blueworld Pools as a salesperson. And I can tell you from first hand experience, they are a scam.
First, they teach you to lie. That you are selling showcase pools. That the pools would be discounted if the customer is willing to allow a sign to be placed in the front yard. Discounts for before and after pictures.
Discounts for customer testomonials. Just a way for them to drop the price and try another close.
They know that it takes three to five closes until a customer finnally gives in. They cheat the customer, and the salesman.