Nitrogen spiking isn't an unhealthy practice- it basically just comes down to false advertising for the sake of saving money with cheap "fillers". If you are looking for 30g of complete protein in a serving, then that is what you want to be getting- if the serving actually only contains 20g of full whey protein, then the cost essentially evens out with the more expensive quality brands from a price per gram of protein. Could just as well buy the quality product and just have a 2/3rd serving- one added benefit being that the more expensive brands dissolve and taste better. And I am using the term "more expensive", but I am not really sure the price difference is that drastic. It certainly is a little bit more, but I buy MTS whey online in larger quantities and not sure the price is substantially more.
There is no real way to answer the ratio question because I don't think the majority of powders will have the full amino breakdown, but a partial amino listing on the guilty brands will often show creatine, taurine, and glycine as the main ingredients.
This article is actually better than the one I posted earlier-
http://boxlifemagazine.com/community...t-you-paid-for