I just recently had 6 Imbued Netherweave Bags made up by someone I found through a query in the trade channel. I provided all of the mats in raw form, meaning this person had to convert the Netherweave -> Bolts and then make the Imbued Netherweave, and then craft the bags. I gave them a 50g tip for their efforts and their response was rather...blah.
I wasn't exactly expecting accolades, but 50g seemed very reasonable if not generous. If I was off the mark and the "going rate" for that kind of thing is generally higher, I'd like to know in the future so that I'm compensating people fairly.
For you Outlands tailors out there, would 50g for 6 bags with mats provided seem a reasonable tip?