Are +fire spell skills desirable?

I have not had any luck selling +fire skills this season. They just sit for weeks and sell for a tiny fraction of what +all spells or +cold spells would sell for.

I havent checked, but I am afraid not really. :/ 

Mirror would be absolutely insane in my point of view, given the dead mana suffix and that this is likely only for some very off meta build (aka cheap).

Doesnt hurt to start at mirror, my guess would be much, much lower.. check how many there are with perfect stats (after whittle), compare with the current item price and decide whether to craft - personally I would expect it not to be worth it further crafting.

It surely isn't a mirror because all the mirror tier ones have T1 cast speed and another item base.

It is still a very good stafff and no other is being sold that is like it: https://www.pathofexile.com/trade2/search/poe2/Fate%20of%20the%20Vaal/EBLD2EBYu5

There are 2 with the cast speed that are mirror tier and there are a few without it but also worse spell damage, crit and extra damage rolls.

So I would say its somewhere inbetween the 1500 div and the 3000 div one. People that can afford the 3000 one or are close with probably go with that, so I would put it at 1800-2000 div.

If there is actually anyone willing to buy it is on another card tho, its surely isn't meta.

+skill is the most important mod on gear as it's the mod that gives the most damage and overall efficiency of effects.

I have a similar one but with cast speed and no crit sitting in my shop. Mods are slightly lower than yours (but still has +7 fire). Been there for 130 divs for 3 days now.

Yea, my gelid with sanctified +7 cold skills with gain cold and gain lightning has been sitting on my merchant tab for almost 2 weeks now, I’m now down at 4200 divs and still no luck selling it. I was under the impression bm’s with spark trigger in a coc comet build would be entised but apparently not.