I got a level 80 weapon called Truth out of a thorny pouch or whatever after the last level 10 story mission. I'm assuming they're not overly rare so I'd be better off just putting it up in the Trading Post for ~2 gold? My engineer can't use the weapon skin anyhow.
Yeah, 2g is pretty standard for exotics. I would only pause to sell if the item sells for more than 6g, in which case I recommend asking in guild chat.
Are skins shared between characters? Or is collecting them really just for achievements?
Once you unlock a skin, it is available forever. Outside of skins given through achievement point rewards, there's a cost of one transmutation charge to change the skin of a weapon. These charges can be obtained by completing maps (cities always give them) or doing PvP reward tracks.
Some skins, classified as "collectible", are part of a collection, but I wouldn't worry about that.
Really enjoying the game so far. I'm now level 13 and still just sort of exploring the world and looking forward to what each level introduces. The vistas are great and really scratch an itch I have for simply looking around and trying to get into odd places.
Are my attacks essentially set at level 13 and beyond and the rest are all things like buffs and heals I'll be unlocking? Or do you get more attack options that you can swap into the existing 1-5 slots? I was surprised when I swapped weapons and suddenly had a different set of abilities. I'll have to actually try that out but I was too set with my dual pistols at the time to swap over to a rifle. Soon I'll check that out.
Engineers can't use many weapons and can't swap between them in combat like most other classes, but the " kit" utility skills work a lot like weapons, be sure to unlock em when you can.