What profit does an agency organizer get on upwork?

Question

Upwork

Share your experience of organizing an agency or working as part of an agency on upwork (odesk).
1) What percentage does the agent take (average for the hospital)?
2) Who determines the cost of an hour of the work of the contractor for the customer and for the freelancer?
3) What is more profitable if you have an offline team: take fixed-price projects under a freelance account or pull the whole team to an agency?

Answer 1

1) I take from 50%
2) You
3) And this and that brings a lot of money.
That is, you earn one x money, hired a person began to earn 2x money, hired 10 people began to earn 10x money, of course the progression is not so direct, but in general it is.