i dont know why yobit still listing altcoin with zero network, seem its bad for trader, but for pumping group its easy to make moneyw with altcoin without network, so he can buy a lot altcoin then pump it and not woried about new deposit :: )
Personally I think it's unethical to sell a coin that has no way of being withdrawn. What value is a coin if if cannot be transferred. It's pointless unless you feel that selling people something they cannot own is okay. Sounds more like fraud to me