Are you basing this off conjecture or from actual testing? Here's a video I just whipped up that demonstrates the amount of damage changing with velocity and not distance:
http://www.xfire.com/video/4ccdf6/
I start off by showing that damage done by melee "at point blank" and "just within range" are exactly the same. I then compare the damage done by melee while standing still, running, running and jumping, and crouching forward. As for whether it actually makes a difference, 150/40 rounds up to 4 while 150/70 rounds up to 3 so the number of melees needed to kill just changes by 1. Not sure if that makes a big impact on gameplay though, as most players are usually moving around so the minimum of 40 damage done by standing still probably isn't very relevant.
If you're still not convinced or think the whole thing was set up, I can send you what I used to get those numbers and you can talk to someone who is familiar with memory addresses to confirm that the numbers are legit.
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