Well I'm not going to sit here and let enchanters do all the whining...
Not technically a trade skill, but my rogue is accustomed now to being asked to open a lockbox while hanging around in (or rushing through...) any of the cities. Or out in the middle of nowehere...and nowhere near the person who's asking, because they just searched for rogues in the zone. Once in a while I'll get a tip, slightly more often they'll answer my whisper as to what was in the box - I get some small reward from knowing someone else got something nice.
But I was fishing in Dala the other day when a dwarf nudged me and asked if I'd open a box (I'm pretty sure he said a box...) His first attempt involved putting the box in one of the trade slots in the trade window, rather than the action slot at the bottom....followed by two more boxes, again in trade slots. I closed the window and told him how to use the action slot. So...first box, second box, third box, got a little rhythm building up here, not taking too much time really....fourth box....tenth box...twelve boxes, total.
I'm already committed here, so I went all through the twelve without kicking off, but latterly thinking "there'd better be a tip and a half in this for me...".
No, of course not, not even a thank you.
So, if anybody runs into me and is appalled that I'm now charging 1g a pick, up front, for random requests, there's your reason.