Time for Some Logic

Human = eat + sleep + work + enjoy
Donkey = eat + sleep

Therefore,
Human = Donkey + work + enjoy
If, Human - enjoy = Donkey + work !

In other words,
Human that don't enjoy = Donkey that work

Men = eat + sleep + earn money
Donkeys = eat + sleep

Therefore, 

Men = Donkeys + earn money
If Men - earn money = Donkeys

In other words,
Men that don't earn money = Donkeys

Women = eat + sleep + spend
Donkeys = eat + sleep

Therefore, 

Women = Donkeys + spend
If, Women - spend = Donkeys

In other words, 

Women that don't spend = Donkeys

So the Conclusion is:

Men earn money not to let women become Donkeys!
Women spend not to let men become Donkeys!