The inference that someone can “buy” a diagnosis is a bit offensive. There are probably some providers who might be less than ethical, but most quality, well trained providers will provide a diagnosis if the individual meets criteria for the diagnosis. That said, having a diagnosis alone is NOT sufficient- it must be supported by the test data that documents the functional limitation that impacts the person’s daily functioning, and rationale for the requested accommodations to provide equal access to the academic environment. That last part is key; they aren’t wanting some sort of advantage over other students - accommodations are to provide equal access. If a student has a visual impairment, glasses may provide equal access to materials. Would anyone feel this is not a reasonable accommodation for their disability? Hopefully not.