i think we ask ourselves that question subconsciously all the time.
true happiness doesn't want to be hoarded, it likes to multiply between friends.
too much self sacrifice, you have nothing left to give any more.

it's like that old saw: 'the best thing you can do for the poor is not become one of them'

and that can be interpreted more than one way...

'The history of public debt is full of irony. It rarely follows our ideas of order and justice.' Thomas Piketty