That doesn't sound fair and right, does it? If that's the case:
1. I will report when it is favourable to me. E.g. If I get a 700, and in recent month it is say a 98 percentile (say due to relatively poorer quality of test takers), I will quickly submit the score to all the schools. Theoretically, I have 5 years to do so.
2. Since we do not know what is the current percentile for the score that we achieved 2 years ago, we may unknowning be caught lying. E.g. 2 years ago, 750 is 99th percentile. So I just put these figures in my application form even if I report the score today. But if my ordered gmat score says it is actually a 98th percentile, then there is a discrepency.
Hence I think a more objective way of comparing this objective standardized test is to look more at the percentile. Firstly, it is more meaningful than the score itself. Secondly, it gives a better comparison between test-takers even if they took the test at different time ("he is a top 1% 2 years ago and she is a top 1% last month").