Husband and I will pick for profit. My parents did it, fine antiques found in basements covered in 5 layers of paint, bought for $25, refinished, sold for $350. Collectable glassware, vintage toys, kitchenware, all kinds of stuff. There are trends you have to follow, milk glass one year, depression glass the next, pieces of Japan, or whatever else. The trends and the economy drive the prices. Recently, stoneware crocks are hot items, unless chipped. Native American items too. Furniture has bottomed out, lucky to get $150 for a solid oak dresser unless it's a fancy piece by Eastlake or something. A no name solid wood dresser used to bring $350 on average. You can get them at auction all refinished for $75.
This hobby has an incredible learning curve. You need to find your market, and your market will determine what you pay. The pickers on TV, they use the internet, they have a network and contacts with collectors. Most collectors will pay retail. The prices they get are different than what someone else may get for the same item.
For example, I bought a WWII dagger. The seller thought it a fake. I fancied it to be real. Paid $100. Retail, for a knock off. Paying too much. But I had a feeling. Contacted a collector in Illinois. Sent photos. He decided it may be real. I drove out there, if it was indeed real, he was going to pay $3200. It was real. Worth the 8 hour drive. If it had been a fake, I would have been out the $100 I paid, plus the expenses to get it sold. It was the tarnish on the blade, the engraving on the blade, the wood of the handle, and the patina on the tang. Could have sold it locally for $2500 tops, and been met with skepticism. WWII stuff... if it's not American... more often than not it's fake. Most of the fakes come from Europe.
An item is only worth what someone will pay for it. What you see in pricing books is only a guideline, those prices are useless without a buyer. Something listed in a book somewhere for $500 may only bring $50 at an auction if the right buyer isn't there.
Different types of knock offs have their own pricing too. Some can be valuable for whatever reason.
With prices the way they are right now, we're only selling smalls, and keeping furniture for the house. If furniture turns around, we'll have a whole house full of stuff we can triple our money on. Not like the new junk you buy at the store that depreciates. The longer that buffet sits there, the better.
Even better if you have some refinishing abilities. Practice on junk. I have an uncle that can repair anything. Take a chair and break it to pieces. He'll give it back perfect. Missing a piece? He'll carve a new one from reclaimed 100+ year old wood. He has a hoard of stuff just waiting for a use.
A lot of hoards, it's because you can't go buy it anymore. Need a piece? Check the barn.
There is a store here, it sells old house parts. New owner of a grand Victorian? They'll have your crystal door knobs and the perfect brass hinges. Weird old toilet? They have the guts for the tank. Looks like a pile of rubble from the road. But really, it has all the replacement parts for an old house that you just can't get, from window glass to porch pillars.
What sucks is when you go to an estate auction. Entire contents for sale, someone who had been collecting for 75 years. But they smoked, never cleaned, and all that stuff was destroyed. Only glass and hard objects salvageable. All the hand made quilts? Ruined. Hook rugs? Ruined. Thousands of dollars worth of stuff.
Worse yet? Major score of a rare Roseville vase for $15. Valued at $200. You drop it on the way to the car. Always bring boxes and wrapping paper to an auction!