How important is it to have identical speaker cable length?


I have a situation where my speakers are different distances from my amp. Would it be wrong to pair a 3-meter cable to one speaker and a 2-meter cable to the other or is it really just a theoretical issue? Many thanks in advance for your thoughts!

benchwarmer
You'll have no audible/sonic issues but you will most likely take a hit when you try and sell them afterwards. 
Electricity travels at the speed of light. Cables runs can be different lengths but I have always run the same length on both sides...just because. 
It's only important if you want to sell the pair.  You will definitely fetch less money for a speaker cable pair that's not the same length.