I'll go ahead and say what won't be worth much, bfly knives, flamberge, jade hammer, plat blade. The Earth staff is probably decently valuable, the grim cesta would probably sell to a collector, so you could price around 10-20k.
Core skin: 20-30k, not sure enough for the other skins to give a conclusive answer. My pc's have been off too much lately, so I am going to be more careful.
Ornate: I don't reckon it to be an aweful lot, but still decent, I am going to say somewhere around 100k, perhaps less.
Plagueborn: you're looking at a nice amount of ecto there. Sold a q9 20/20 Earth for 30e a while back, I think DF is a little more sought-after, so some 40-50e, perhaps up to 60-70, but not too sure.
Butterfly Knives - 3-5k
Flamberge - 5k/merch
Golden Maul - ~30-35k
Grim Cesta - Not sure it'd be worth much. +10 vs dwarves is pretty useless.
Jade Hammer - 5-10k
Obsidian/Orrish Earth Staff skin is worth way more than core - it's easily the most popular of the five earth skins. Like that Canthan skin Fire Staff that was around a month or so ago, I'm not sure if I've ever seen one 20/20 uninsc. I'm going to guess that it's good for 50e+, but wait for more opinions.
Agree mostly with Jimbo - especially about the earth staff. Post in high end and see how it goes if you are looking to sell.. would look for a good bit of ecto ;P
the cesta a collector would pay 5k or so imo...
golden maul 40-50k or so... not too many around, popular skin
Plagueborn never seen a 20/20 divine sell very well. Might match the earth one or a bit more.... 30e range, hard to sell
It isn't useless but a lot different from what was stated at first. Orrish earth staves are extremely rare as perfect r8's, and even other 10/10's really are not any use but some sell for loads. That one I'd want 20-30e+