There is no such way to drop a customer's bill in half like that. I see no way how that guy would know what the customer was paying already. He could easily save someone $50 if they were switching providers but I see no way possible to save an existing customer that much unless they lowered their programming.
My experience with door to door satellite sales is that they are very shady.
You just feel that way because they take business away from you and your retail store.
And hell, Dish corporate is very shady with the things they do sometimes.....