Feeder club have 3 main benefits:
- First refusal on their players. If there are any bids accepted
for any of their players, you can bid at the same amount which they
must accept.
- Financial benefits. Sales of merchandise. Get clubs in USA,
Japan, China, South Korea, you get the idea. 
- A nursery for your young players who cannot get a work permit.
Let's use the case of Dong Fangzhuo for Man U. He was bought by Man
U but he cannot get work permit cause China's FIFA ranking less
than 70 that time over a time period, so Man U sent him to some
Belgium club for 3 years. So now, he has a European Union passport,
which bypasses the need for him to get a work permit.
For teams in Europe, if you want to do this, Poland and Belgium are
the best choices cause they need just 3 years for the person to get
a European Union passport. This is the shortest you can get,
compared to either England or Spain where you need 5 years.
For Parent club, you have also 2 main benefits:
- Parent club may send their players to you on loan, where you dun
have to pay their wages.
- The Parent Club will typically play a pre-season game with you,
with you at home ground and you get to keep all proceeds. Plus,
your Parent club will give a small amount of money every year.
