I guess they could create a system where you develop a reputation as an infamous thief even if you don't get caught on the spot.

Hostile guards and merchants should make your life more difficult in the long run.

Originally Posted by Wormerine
I am afraid it is one of those Larian's "it breaks the game but is FUN" things. Merchants have been a joke since D:OS1.

I suppose to some it is "if you don't like it, don't use it", to me: "can't roleplay as a thief or the game falls apart".
Also for me it's the opposite of fun because it makes playing a thief a cheap and tired exploit that is not satisfying or rewarding in any way.