I have been coming to this pawn shop for probably 10 years now and if the 15 or so visits, I have only seen the Old Man in there one time and he was peaking around the corner and not really out mingling with patrons.
Aside from that, this is a place that might have been a great pawn shop at one time but is more of a showplace for the TV show and it just feels very commercialized now. They do have some Pawn Stars shirts, hats and collectibles if that's what your looking for.
If you have never been here it is something that is free and worth at least one stop. My number of stops is really a result of me bringing other people to Vegas and this is a quick stop on my long list. I would suggest going during a weekday and maybe between 10am and 3pm if you want to get in and out. On the weekends there can be long lines and instead of this being a 30 minute stop in can become a 2 hour stop while bumping into people the whole time.
Enjoy!