It's a big problem in my opinion, universities look at predicted grades as to what an applicant should achieve, so applicants can lose out on offers just because someone in another school was predicted higher grades. Saying "They could be disappointed at the end of the year" means nothing to some pupils, because pupils want offers at unis they want to go to. If someone got BBB at AS and was predicted AAB and got an offer from Loughborough for Economics, say. They don't care that it's two grades higher, they have a chance of getting in, and are better off than if they were predicted BBB and were declined an offer and had no chance of getting in.