The essence of this expression is suitable for very energetic people, because they can make money on everything. Therefore, they spend a lot and get twice as much, the type of people who can achieve a lot always say like this expression.
I also think that's what only the already successful and rich say. While ordinary people, having spent all their money, will not be able to get it twice as much as those who have a fixed income, this expression is not relevant at all. Unless you're not a seller of some parts.