i thought most cymbal makers melted down and recycled factory seconds and returned cymbals. it might be more common than you think.
about drumsticks made out of plywood, i used to have a pair of plywood drumsticks a long time ago with nylon tips. i don't remember much about them, except they looked cool. i think they were pro mark sticks, but i'm not sure.
about different types of tips, there's been a lot of different tip materials tried over the years besides nylon. i've even seen metal tipped sticks. today there are still sticks made with unusual tip materials.
I think the majr brands may remelt their scrap or cuttings, but I doubt if they melt down any old cymbal not being sure what it's made of. They do have reputations to uphold, not to mention the overhead of buying, shipping and storing used product. I don't think there is that much of a market anyway. Most cymbals last forever treated properly.