Because for the application I want, they work well.
You have to make the distinction about impact velocity. This is a LR hunting forum. At extended ranges, bullets have really slowed down. The 'tough' short range bullets may start to expand irratically causing problems on game.
Match bullets whether MK or AMax, are not made from wet tissue. They are actually quite strong. As strong as a Barnes X? Of course not. But I would never expect an X to expand reliablity under 2200fps. No issue with these match bullets.
Just use the right bullet for the impact velocity and game you plan on hunting. Today there is not really any bad bullets, just the wrong application of that bullet.