Art or historical objects help to bring to life a family's history, or to reflect world events. As the Antiques Roadshow visits different cities, you also get a perspective of the local culture. For younger viewers, the show is definitely educational.
An object/art collector can find special interest when a fellow collector brings in a choice object. As an arctophile (teddy bear collector), I find special interest in such things such as Steiff bears. To find out what determines value in a teddy bear is especially fascinating.
The sometimes stunning monetary values of these objects, and the reaction of the owner to the values add to the entertainment of the show.