Yes, she uses expensive ingredients but part of her point is that if you're going to have to make a move from food that could kill you to more complex foods you might as well treat yourself well. That rebuilding the relationship between you and food may be more complex than you think and that you should treat yourself to the best because less than best can be adulterated with wheat which can lead you back down the path of pain and illness.
I am myself someone who has had to rethink my relationship with food. I had to give up gluten before I could get a firm diagnosis but any gluten in food makes me quite ill. This led for a while to an almost avoidance of food on my part, which was almost as unhealthy as the food issues themselves. I haven't quite got around to fully fixing my relationship with food but I'm getting better. It's people like her who help and reassure me that I'm not completly crazy.
