What kind of quality criterias do you apply? 4-letters net is a tough market.
Sure, NameBio shows some weird sales of 4l .net, but for most part - these are words or something that makes sense. I think for .net you can find better 4 letters available on the market. However, iwwi has a chance, imo. Don't rush to sell, why would you do it for $19 here on NP? Domainers only buy it from you if you sell it for $0.25...