I'd buy them for the cost of the brass, bullets and primers but certainly wouldn't shoot them.I know how we all technically SHOULD answer this question. I'm wondering how folks WOULD answer it.
As some of you know from the "Yard Sale Finds" thread, I just had the opportunity to buy a heap of stuff from an estate sale my brother in law is handling. Among the items are 1200 rounds of reloaded .357 ammunition. I obviously don't know the person who reloaded it. But he reloaded at least eight different calibers from what I can see, and he used a Dillon press to do it. Neither of those facts are definitive, but they SUGGEST that he was experienced.
Would you buy and shoot that ammo? I don't shoot .357, so I have no reason to buy it, but I have two friends who are interested in it. My advice to them is that while it's very tempting to get that much ammo for what will probably be around $0.30 a round, it's a pretty risky proposition.
$0.30 for reloads of unknown origin is a ridiculously high price IMO.