At even 50% lead yield on what should be abut 110 - 120 lbs. per bucket consistently paying $40 is getting WW lead at around 70 - 75 cents a pound. Increase the lead percentage and price per pound of lead drops below that. Seems like a pretty good price to me. True some work is involved but if you can invest the time they are certainly worth picking them up.
I think the last WW lead I saw for sale here was $1.20 or $1.30 a pound as I recall. Lead at $1 a pound is considered pretty decent price.