You mean it's expensive to you......Is it overkill? Probably depending on what else they use their computer for. In the end it's really no different then they guy down the street who tunes imports, some people just want to see what kind of monster they can build
Really good advice though for people who are looking for the most bang for their buck on a gaming only rig. Core i5 3570k's are more then enough for gaming while giving you a good option if your into OC'ing and the Athlon II X3 is pure goodness for the price.