Because they sell 10% 2.5 and 99% 5 gallon. There is about a dollar more steel in the 5 vs the 2.5 and exactly the same labor making them. (probably adding some labor to cut the steel in half for the 2.5)
But on a higher note... LHBS closed/sold off. Old guy, I can say that, he was older than me, didn't stock crap for liquid yeast. I never have liked dry, have had bad results. So new guy is opening in evenings as he has a real job. We'll see what he stocks. Otherwise, I'll make a trip it MO once in a while.... Shipping cost is going to kill a lot of things. BTW, free isnt free. I costed a 6 item list (no grain) from a $35+ free vs an add shipping, and add shipping was a couple of bucks cheaper one $100 order.