The 30 grams things came out of body builders (of which I am definitely not one). In terms of muscle-building and muscle-retention, anything more than 30 grams at a time probably isn't going to have a much bigger impact than 30. But that protein is used for many purposes, including amino acids and any excess protein is broken down into energy.
At least for me, its a good source of energy. If I drink the Chike shake at 7:30-8am, I'm not hungry until noon. And I routinely get >100g of protein throughout the day. I am losing weight (135 pounds as I approach my six month anniversary), my doc loves my bloodwork and I have great energy, so if it ain't broke, I'm not going to fix it. I am not going to make perfect the enemy of the good.