I don't think that there's any definitive study or proof, but I have a great deal of difficulty believing that playing vinyl with deep scratches and similar damage is not going to affect stylus and/or cartridge life.
Think about it for a minute. While we all probably do it from time to time, it's not going to be good for the stylus/suspension if done on a regular basis.
Think about it for a minute. While we all probably do it from time to time, it's not going to be good for the stylus/suspension if done on a regular basis.