The problem with the gun you posted is that is advertised as a matching rifle, but has had significant work post-war. Any work done to a 98k post-ww2 is a detriment to its value and interest as a ww2/Third Reich historical artifact.
Now there are plenty of interesting and desirable post-war refurbs. Done in a official capacity by nations ranging from Norway to the USSR. But pretty much any post-war refurb will be worth less than an original German era K98k.
However, what I suspect you have is a bubba special of somekind. At the very least the bolt is. And folks just aren’t really interested in cobbled together builds/fakes done by some random dude… probably to try and make a few hundred bucks back in 2003.
Does that make more sense?