I stand corrected! At least in terms of the commodity price. A product made from a raw material can become relativly cheaper through mass production or bulk buying. Also factor in weight re transport costs etc. I’ve always had the impression that it had a good value, if not mega pricey, at least in a way that made it unfavourable for uses like this.

Don’t worry, lead isn’t that toxic. It takes a lot more exposure than the occasional handling to get heavy metal poisoning from it. But yes, odd to use lead as a weight (or put a weight in, perhaps it’s a heat-sink?) it’s fairly expensive. It could be a lead alloy which makes it more malleable, though a small peice of pure lead like that I’d expect to be easily bendable, but not compressable like clay.