Coin Values

I'm just getting back into coins after a couple few decades. I bought some coins at an antique mall today, sort of a consignment type place, so the actual coin seller was not present. I looked up several coins on the PCGS CoinFacts app to compare the asking prices and found that several were priced below the listed PCGS values for grades 1-4. For instance, two very worn Barber half dollars were marked at $20 each and the PCGS value for Grade 1 is $34. I also picked up a decent looking 1890-O Morgan dollar for $37.50. PCGS value for grades 1-4 was $38-$40.

Was I correct in thinking these were no brainer purchases?