I'm with jcwit. Reloaders were recycling before there was recycling, so wasting any material just goes against that. The mountain men used to reclaim the lead balls from game and remelt them. So did the buffalo hunters. If they could do that, then we should be recycling everything usable, including primers.
If you had ever seen the mining process for copper ore, or any other ore, and then the manufacturing process to make the final product, you'd have a much better appreciation for the time, effort and money that went into making your simple little primer, or anything else you use on a daily basis.
I'm anything but a tree hugger, since I think there should be a season on them, but waste is waste, especially when it's not necessary.
Hope this helps.
Fred