1) Whoever is managing Amber is doing well. She is one of the top stars in her business and makes a lot of money.
2) Why would she want a manager who doesn't have knowledge about this industry? I can't see that MC would be qualified to manage one of the top stars in this industry.
3) MC has a reputation as a respected actor. I don't think it would be good for his reputation to become a manager for a porn actress. It would also be bad for Sophia's reputation is she has the same manager as a porn star.
1. Well, she (Amber) clearly complains about her manager. She even suggested that MC becomes her manager, quoting "so, if you want the job, it's yours."
2. MC just recently became Sophia's manager and doing good so far. And overall, I don't think that adult entertainment cinematography is that far apart from regular. Well, screenplay, production - probably are. But we are talking now about actor\actress management: scheduling, logistics, promotion, personal care, assisting and arranging legal representation - which is more or less similar. And MC does have a good understanding how things are happening behind the scenes. Would MC be fully qualified to represent Amber? Another quote by Amber "I'm sure that you're capable of learning what you need to know", meaning she trusts MC. Would he actually be able to do that - no clear answer but everything is possible.
3) Now that is a valid point. To some extent. It would be tarnished more if he would participate in same movies as Amber. But he is not. Would Sophia's reputation suffer if she is using same air fare company as Amber? or eats in same restaurant? Or even dresses with the same designer? Obviously personal Manager is more involved than just a transportation\dining\clothing. How about lawyer? Would Sophia's reputation suffer if she is represented by the same lawyer as Amber. Frankly I doubt that.
Anyway. I've voiced over my suggestion, provided arguments (that I consider valid). I'm not planning on arguing further as all of it is strictly hypothetical.
If the suggestion will make the game this way or another - I'll be glad.
If not - so be it. The author doing fine so far even without my suggestions.