The "trick" he mentions is that you make a no hassle "I'll haul it away at your first convenience" cash offer and be prepared to walk away.
People that want to share their life stories or like hemming and hawing over $25 dislike the approach.
Sounds like a good approach to me. More times than not when I sell something on CL I have people that agree on the price, drive to my residence and then try to have a 30 minute bonding conversation with me

, and then want to pay less because of the amount of time it took for them to drive to my place. As if they didn't know how long the drive was when I gave them my address! Give me $25, a 6 pack of a tasty IPA, don't ---smurfette--- about the length of your journey, and I'm a happy camper!