I've recently experienced this "Lexus Plus" process at the Omaha Nebraska store. This program is nothing more than an excuse for those who are either scared to or don't know how to negotiate a deal feel better about themselves making the purchase. When in reality, it's a marketing gimmick and as noted above, a reason for the sales manager to say his/her hands are tied. Lexus of Omaha hides behind this even when negotiating your trade value!! They decide what they will pay for your trade and that's it. Really???
I've read comments from people who like this approach using the comparison of buying clothes at the mall saying "you don't negotiate at the GAP". Well, saving $2 on that summer T is no comparison to saving $2-3k on a car purchase. That comparison is flawed.
Don't be lazy, do your homework, leave your emotions at home, then walk into the dealership and offer a fair price based on your analysis keeping in mind, they need to turn on the lights and be there when you need service work.
I really hope this doesn't catch on.