You go to a university to "learn" not to get "marks." You pay them for the privilege to learn, not to "buy" marks. Marks are just to show you and others how much you have learned. If you and everyone else gets the same marks, neither you know that you have learned anything, nor does anyone else know that you have learned anything.
Moreover, the universities which do grade inflation, which is something similar, lose all their credibility. For a couple of universities, whenever I interview a student of those universities for admissions, I don't even bother looking at their GPAs, because everyone gets higher than 9 out of 10, which makes a ten-point scale absolutely meaningless.