Well I'm sure it's hugely popular at parties and elsewhere outside of combat. Shall we give it 'earning money' rules like Perform and Profession checks, or would that be too depraved?
I'm sure you could find someone willing to pay for its affects, sure

In combat, it kind of goes both ways.
Aye, its a bit of an odd duck, but I could even imagine it being manifested on folks to help them out instead of trying to Daze them. However, offensively, what you should do is manifest it and then immediately stop concentrating next round. Boom, instant -4 penalties without a save for an hour.

Hang on... Will save negates the daze effect, but what about the benefits? Can you make separate saves? If so, the Saving Throw line should be something like 'Will negates (harmless) and Will negates'.
Naw, one will save in the beginning to fight off the ability period. Then you have to make additional ones as you become addicted.