If you don’t have the money to bring the wreck up and preserve it properly it is better to leave it in place.
That is of course if its location has not been revealed publicly.
If the wreck’s location becomes public knowledge you might as well bring uncover the wreck and salvage what you can before the looters get to it.
As the tech to identify, explore, and salvage deepwater sites becomes more widely available, it's a good bet that rich bungholes from the Third World will be robbing all kinds of sites for their own collections.