Servants guild once you have bought base classes have poor usage for guild points. 

Worker guild and warrior guild have base materials (and now with the material restriction it's a good source of obsidian) dragon skin and bones are top materials. Mage guild have the big blue crystal that is useful.

I have thought about what the servants guild can provide and I have thought about custom slaves like a slave of a specific race, sex with one or two specific traits. Or maybe a training to gain a trait, I really would spend guild points to be able to buy a human with the +20% collection speedy trait. Maybe on the next exotic trader visit you can have your command. You can link this service to exotic trader, and servant guild upgrades.

It was in the first game, so you have a point. I'm hoping for a special item vendor now. Grinding in this current build is exausting. Imagine being able to buy a magic circlet or a spellbook for 2k gold instead of praying a crypt will drop it after trying for nearly an hour.