I would be interested, depending on the final price.
Realistically, our mail carrier would be pretty unhappy with me if he had to deliver a 70 pound package. I bought about a 44 pound lot of lead a while back and it elicited some comments, but he was good about it. I can see his point. Sometimes a lady fills in for him, and I don't think there is any way she could handle 40 pounds. I would be more likely to buy a smaller flat-rate box, probably no more than 25-30 pounds.
I think I'm pretty well fixed for lead right now, but if it is offered at a good price, I would be interested.
Notchy Bob