Public television's Antiques Road Show has been on the air since 1997. The show features a migrating band of antiques appraisers, who are shown a parade of neat antiques brought in by locals. The experts predict a value of the antiques and attempt to elaborate on the histories of the items. 

It is really interesting. Even in a young country like America, tons of crazy, unexpected stuff shows up. I've never counted, but a single hour-long show might feature 18-25 items.


A bunch of other shows propel the plot with neat items. Once I noticed the pattern, I realized how similar these shows are.

By the way, reality shows are fake.

Pawn Stars - People bring in neat items to sell or pawn. The pawnstore owners offer sometimes offer to buy their items. 
It is possible that all of the items showcased on the show really showed up through the normal course of this shop's business, but a more likely scenario is that the producers rustle up interesting people and collectors to bring in items to be featured on the show.
According to IMDB, the store is emptied whenever a segment is filmed.

Storage Wars - Four teams of antique dealers attend and bid on abandoned storage lockers, finding fun, neat items inside and discovering the items' value. After a couple of years on the show, one of the stars, Dave Hester

“The truth, however, is that nearly every aspect of the series is faked.” he reported. His lawsuit alleged that Storage Wars regularly plants valuable objects in lockers — a trick known as salting. The suit accuses the production of staging entire storage units and asking Hester to salt lockers with his own memorabilia.

http://www.businessweek.com/articles/2013-05-23/the-reality-tv-dissident-dave-hester-of-storage-wars

American Pickers - Two antiques dealers travel the country exploring barns and unearthing valuable objects within. If they find something they like, they will buy it and reveal the potential resale value of the item. 

The show could be augmented with interesting items seeded into otherwise unspectacular barns. The point is to show a dozen interesting items during each show, and to tell their histories.

American Restoration - A team of restoration artists reviews a few interesting items and restores them to a like-new condition.

Auction Hunters - A pair of antique dealers explore the treasures they find in abandoned storage lockers.

Car Chasers - A pair of dealers explore, buy and sell rare and exotic cars.

What's in the Barn? - One host travels across the country to find and explore rare vehicles. 

Savage Family Diggers - A family of metal-detecting treasure hunters finds buried items. It would simply be much easier to fake this show than to rely of finding a few interesting items during each show.