No argument needed.
Here's the site I am drafting from:
http://fanspeak.com/ontheclock/premium.php
I am sure they have some variability factors involved so players do not go off the board exactly as ranked. Besides, guys like Mel Kiper, Jr. routinely change their boards for no other reason than to drive more traffic. A lot of it is just a scam. However, if you'd like, you can start with the Fanspeak board they list and then re-rank them yourself if you think they are rating guys ridiculously high or low.
I prefer not to do that but if you buy the premium for $5, you can probably set up the board the way you think it should be and then simulate.