I look at it like this... science is useful, but when it comes to building muscle, I find a little bro-science can be just as useful.
Not everyone is the same and stating no benefit over .82 grams is way too generalized. when it comes to building muscle/size, calories are what one needs to be concerned with in the big picture. eat more, get bigger, eat less get smaller. As you break that down into where our calories are coming from there becomes an issue with your .82... I for one start getting fatter if I consume more than 250 grams of carbs in a day (if done so regularly) I still need to hit 3000 calories in a day and if I know I have to limit my carbs, I only have fats or proteins to make up the rest....
Sure chicken breast isn't overly cheap compared to something like rice, but even at a lb o chicken a day that's only around $3/day..... hardly what I consider expensive. I eat over 1 gram of protein per lb a day and I eat for around $10 a day. Not sure if you have shop veges or fruits, but protein is not usually the most expensive part of my food consumption
edit:
and just for 'its and giggles, post up pics of your build. I would assume you eat no more than .82grams/lb and must have fairly impressive build?