Yeah it comes down to their specialty, just like engineers or doctors, Mages are skilled talented employees. They have extra gifts, sure, but that doesn't mean all wagemages are going to be patroling around the astral looking for brawls, only your security group will be up for that.
Routine mage stuff: create and maintain wards, Medical related (heal spells, detox, sterilize etc), Summoning (Binding) assigning spirits to do stuff, Spirits have a huge number of powers and uses, talismonger/enchanting/alchemy, creating new spells, recruiting, meetings, ascencing services (you have to figure companies would jump on using ascencing, with it you can learn all kinds of stuff, healthy not healthy, truth detection).
If were to make wagemage book the biggest section that would be off interest would have to be group magic, while mostly ignored in the Normal level play imagen what you could do with it in a magic team, wanna move dirt? No need to get millions worth on construction gear, call up a high force great form earth ele, and let it grade the site. There are so many large scale uses for group magic that I'm sure could blow away the way normal things get done.