I would say 1 out of 5 people on there are not wasting your time.
I listed something super cheap and got tons of responses, never heard back from most of them. A week later one of the first woman to respond PMs saying she can now pick up item. I tell her it sold a week ago and she nuts up.
The worst part is that the things that seem to have tried to replace it don't really offer anything better - just slower performance and mobile requirements. I'm thinking Offer Up and Let Go.