but i think OP is talking about Big Gains or wins as jackpot?because there is no way we can risk our lives with 400$ winning.
if we get the Lottery jackpot then for sure we must keep silent even in our own family,just act normal first and set things first before letting them know how much you have won.
We must keep our mouth shut, many people will have an interest on the money that we are earning it could risk our life. Having a low key life even we are winning will be our most priority above all. Also, I dont want to make somebody elses feels sad because they did not as lucky as I am.