Do you call every single seller back? Even when they sound unmotivated?

[Matthew B.]

I've been getting a ton of calls and voicemails. Many of them I don't bother calling back. Usually this is because the property is something I would not want to own or flip. I also get the people who say "I may be interested in selling... for the right price!". In my experience, these people are unmotivated and calling them back is a waste of time. But I always feel bad about not returning the call. How do you handle phone calls?