Chrycopaul, sad to say I don't carry very many current coins in my pocket. I buy everything with bills, checks and credit cards; and what little change I get goes into a box, which goes to the bank to cash in every couple months. The last real use I had for coins was on the tollway, but that's all electronic now.
As far as why I carry the old coins - they may not be spendable or valuable, but at least they're in motion again, jingling around like coins are supposed to (especially that Peruvian 2 reales - it rings like a bell). I get more enjoyment carrying them around than having them in an album or a box. I'd like to be carrying a F+ 1861-S quarter or even an AG 1916-S half, but I can't without wrecking the patina.
And if I lose one, I know where I can get more. The only one that would hurt would be the half eagle.
"Two minutes ago I would have sold my chances for a tired dime." Fred Astaire