I've wondered the same. I guess just limited number of individuals who would scrape even if clone tool was less expensive. The people who do it for a living probably already have their tools & probably wont wear them out anytime soon. The other aspect for hobbyists (purely me watching videos & such) is you need a bit of grinding setup to properly dress the tools, at least if they are carbide. I cant recall the wheel off hand if it was diamond or CBN? & some alignment accessories. Didn't seem to onerous & those wheels can be reasonable priced, but a few more $ to throw at the tooling. Unless I'm mistaken, you can of course scrape CI, but I don't you think can recondition typical induction hardened surfaces, so that eliminates many current lathe bed ways. But probably fair game for older machines. Personally I would just like to make accurate fixtures & such.