Humans in nature are greedy and wouldnt want to share anything unless its a situation or a must or a genuine gesture to help others . Now history tells us that the first breaking of the Law in Islam was people refusing to pay Zakat ( money ) which is one of the Pillar of Islam . And many people cant part with their money .
The question is would you or can you go 50/50 with :-

1- Family
2- Friends
3- The needy ones
4- Building up a country

If Yes/No explain why and be truthful . bear in mind there are some in families Like Brother and sister ..etc the brother or the sister are lazy and do not work would you really give 50/50 :)

I wouldn't mind sharing my money with my family but if the money goes out side my family I certainly would like to know to who it's going and through what organization the needy people are going to get the money.