For the same reason people mod cars instead of all buying Porsches. And remodel old houses. And for that matter, refurbish vintage LP12s. For me, I’ve found the Denon tonality gets me 80% of where I want to be. And the Zu modded DL103 gets me 100%, without having to try a bunch of other different carts from Dynavector, Hana or Benz. Whatever floats your boat, right?