Here's a link to a thread on page 3 of this section where the same kind of question was asked. I've seen this same kind of question asked often over the years. It's either impossible, or extremely hard, to give a 100% correct answer.
There are some problems with making such a list ...
1) There's a big difference between "rare" and "popular." I'd argue that, for example, Voltaic Spears are FAR from "rare." However, they're very popular right now, so they're most definitely worth selling. Similarly, I'd say Melon Hammers are pretty rare
(I never see them drop, and I see a lot more players using VS than Melon Hammers,) but there's almost no demand for them.
2) It's not just skin that makes a difference - the stats of the item are important, too. For example, max r9 insc. Round Shields can be hard to give away, yet I notice a fair amount of wtb ads for this skin specifically in low req versions (16/8, 15/7, etc.) As common a skin as they are, they seem to be popular with a good number of players ... most of whom appear to be building caster shields.
3) Generally, supply these days vastly exceeds demand for most stuff. With so many people chest running, farming, and using the zChest, etc. the market is often flooded with max, gold r9 versions of skins that used to sell for XXe+
(examples are Elemental Swords, Dead Swords, Colossal Scimitars, Dead Bows ... I could keep going for a while.) So, while you might have a nice and popular drop, you may not be able to reasonably expect to sell it for more than 5-10k, if even that much.
4) Tastes vary! One man's ideal axe skin is another man's merch food. :/
5) What's worth keeping and trying to sell is often a question more of what's popular than what's rare. The popular skins change over time. The meta changes over time, too, and affects the type of weapons that are popular. Right now, it can take a long time to sell most gold r9 scythes for even 1-3k. Not many people are looking to build new scythes.
If someone can make up a rare skin list, I suspect it will be ...
- subject to a lot of disagreement and/or contest over what should and shouldn't be there
- out of date within 6 mo.
The best advice I can give you is to check out the skin galleries on Wiki and start spending time watching trade chat in game and reading sell and buy threads around here.
http://wiki.guildwars.com/wiki/Categ...leries_by_type
I find that once I'm familiar with a skin it's a lot easier for me to notice and remember if I see evidence that other players consider them valuable (from wts and wtb ads.)
Sorry I can't help with your list.
EDIT - Well, jimbo has accepted the challenge! Huzzah jimbo! I do wish you the best of luck!!! We're pals, and I've been going through his list and sending him my feedback on anything I *think* he may have left off that should be on there. If he's willing to take on such a task, I'm certainly willing to do what I can to help out!