the way i see it is if the DSR doesn't state it then im not doing wrong tbh.
So because it's legal you should be able to do something that is clearly immoral? You specifically mentioned bad overclocking which should mean that OcUK wouldn't even consider refunding your chip, seeing as you've ruined it for the future owner.

if doing something has a negative impact on other people even if you can't see it personally its still immoral. So case in point (and I'm not saying or implying that you are or might be doing so) someone abusing the DSR results in a higher cost to the company an eventual rise in the cost of products impacting (potentially) innocent buyers and more restrictive rules to the DSR which could impact on people with a genuine use for it.