Well, if you farm tons of golds (vaettir, raptor etc), you should sell them as unid. All the skins that drop there are worth a few k at best at q9, and ~ hard sale. If you only get them once in a while and from various places, you have a better chance of getting good skins so it might be worth it to ID them. Especially so if you get uninscr golds, as they could be worth quite a fair bit.
Ciders sell for 2-300g for people who need them for scavenger thingie. If selling to an alcoholic, they go for some 70-80g/per.