I'm on my sixth set of iron since I took up the game in 1961. The only two sets I regret not keeping are my first set of clubs, 1960 Wilson Staff's, and a set of Ping Eye 2's that were in great condition.

If you're never going to use the 2nd set anymore, and if they have no sentimental or re-sale value, better to give them to someone who can use them - maybe a new golfer?