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!