Its seems like protein powder is cheaper than food sources of protein because its more concentrated. Also, I heard that your body absorbs different types of protein better than others and supposedly most whey protein powders have the best protein absorption rate.
Maximum I take is about 75, i agree w/ the guys talking about eating real food. Nothing compares to it. Whey i'd use postworkout or if i'm lagging in protein intake then i'd supplement if not i try not to use it.