Definitely a market for anti-scrying, non-detection, etc. There are spells which will conceal you against divination and you have to expect some shady individuals providing those spells and items, which will allow thieves to operate. If you have regulation covering who is allowed to do business as a seer, people who have lost that permission may naturally migrate into this other role. Also, there will always be a class of minor crimes (e.g. shoplifting) which steal less than the cost of divination, so they won't be economical to prevent.
There is a substantial gray area where your divination on, for example, how to make one businessman successful may not be targeted offensively but someone else is going to suffer (or at least lose business). That will probably be legal, and as a result both businessmen will employ seers and anti-scrying precautions in order to advance their own careers. There might be rules about how directly one can target one's competition, but it's also possible that not having scrying protections is considered the equivalent of not closing your curtains, i.e. it's your own fault.
Privacy also extends to lots of non-business situations. Threats, religious rivalry, a spouse suspected of having an affair, etc.
If you have a legal system (and not just noble edict), you might have rules covering the role of seers, divination, mindreading, etc in court. E.g. you have a panel of three independent experts, who must disclose if they have any personal interest.
Seers are good for knowledge acquisition in general, you might also have more museums (all those artifacts with really interesting histories), an interest in archaeology (which could also mean tomb-robbery), etc.