That sounds to me like a great way to choose a chef, no?
When I go to buy a car, I haggle with salesmen and test drive cars, all for free, before I choose one. When I am condo shopping, I go see many buildings, and many different agents give me the sales spiel, free, before I choose which condo I want and provide the commission to that realtor.
I don't understand how this method is in any way bad for the consumer.
As far as this service, it's good idea, but that price point is pretty intense. I'm not very good with PowerPoint, but I can definitely "prettify" more than 4 slides per hour. At that pace, I'm paying you $100 an hour for equivalent work? If you can find enterprise clients willing to pay, that's good stuff for you. But I couldn't pay this.