I agree that it's really hard to shift decent lower value tunes on Ebay nowadays. I hardly bother putting them on Ebay. Last few things I had, not just soul, but also some doowop and reggae, went for peanuts, like 1 Euro or 3/4 euros max. Even though they were worth much much more.
On the other hand, I had three 70's tunes for sale on SS, each worth 300+. None of them sold. Even with price reductions. Eventually I put them on Ebay, But-It-Now prices at my initial prices. They all sold in the end.