I've heard about three different things happening a lot:
1- the first two days, TONS of money, and then barely anything once the "NEW" sign goes away and having to work from there.
2- the first two days, the room is overrun with trolls, and the model quits in tears
3- the first two days, TONS of money, and it lowers a little after the new sign wears off but still goes strong and keep increasing.
The only consistent things about it are
-you can't tell what your room is really gonna be like until that new sign goes away.
-any change (be it scheduling, taking a day off, changing your look or style, changing the mood of your room) hurts your income.
-it takes a lot of work to get anywhere and stay there on MFC.
I've been gone for one day, come back to "I thought you left MFC!" from someone who has been there every day. I love "Welcome back! How was your vacation?" When I was gone a whole two days.