I almost always buy used. Better deals. Most used guns have almost no use. The avg person doesn't shoot that much. People buy a gun, try it and don't like it so they sell or trade for it. Or they just add it to their pile until something else comes along that they'd trade for.

I just look them over to make sure nothing is broken or rusted. Other than that as long as the price is right I don't care if it has finish wear. I'd say 95% of my handguns were at one point police guns so they all have holster wear but the prices were too good to pass up