Aretha hat!
I agree. It's her job to save people from that so I love how that is her reason to stay. She doesn't care about the money but about the person staying sober, it's an innate trait in all of the Watson's in Sherlock Holmes adaptions.

Hopefully with him pursuing Moriarty it means that there will be some backstory to Irene in the future episodes and hint to him relapsing or flashbacks to when he spiralled out of control in the past.

I'm so excited!