DLV looks quite ok to me but I think the screws on the lower fitting have been replaced.
The Horster RLB looks like an honest piece although the condition of the scabbard is unfortunate.

The grip of the other dagger i couldn`t comment on I have not really studied these models.

price wise i think you would need to guage what the dealers are asking and reduce by 50% to get any realistic market value.

And you are right about the forum unfortunately. Dodo springs to mind! I don`t know why there are still a lot of people active in the hobby but not much stimulation. I think the stupid hype and over-pricing of everything has knocked peoples enthusiasm.