Hi.
This project sounds interesting.
As I understand, we should generate a graph for a user, according to monthly profit, and it should be static for a month (each time user come, he will see same numbers for same days).
It can be generated and saved to database (easier way), or build algorithm.
If user A and user B registered same day, and loaded same amount of money, will graphs be the same?
Also, you didn't mention what language should be used to build client area.
I'm PHP developer.
Anyway, I'm ready to start right now.
Regards,
Alexander.