mappleby
Schools all say they use this information only for marketing purposes. In other words, they use it so they can provide statistics like how much their class improved their salary from Pre-MBA. There is far too much variability between career fields for it to be used for anything else. For example military and government folks are paid based on age and rank not performance. So you can draw literally no discernible information from my salary data other than it corresponds to a specific block on a pay chart.
Hmmmm, maybe... but at the same time, they are experts in all things careers, and they have a lot of material for comparison. They take tell the difference between someone who is making 60K in industry X in country X, and someone who is making 90K in the same.... I don't think it is so simple as "Joe, the PE guy from America makes 10 times what Raj the entrepreneur from India makes, so he must be better"... not at all, but still, within your won country and industry, I would say it is somewhat significant.