what happens to old ballparks

Did you know you can buy all kinds of jewelry made out of parts from old major league ballparks? Apparently when they take out the chairs or whatnot, they reuse them by making ballpark cufflinks and necklaces and bracelets, then sell those to sports fanatics who are willing to pay ridiculous amounts of money for a scrap of the old ballpark. I'm all about "reduce reuse recycle", but this is just kinda dumb...