Odd, because I hear about it in nearly ever comment section on articles about the sinking of the Titan.
The difference is not money, it's novelty. The fact that a submarine built with hubristic lack of adequate safety was lost at the site of the Titanic's wreck is going to catch a lot of attention. It fits so perfectly into the narrative of the original Titanic's sinking. And losing a submarine at all is noteworthy, that doesn't happen very often.
A ship loaded with immigrants sinking in the Mediterranean is, unfortunately, a Tuesday. It's like the Joker says, nobody panics when everything goes as expected, even when what's expected is horrible.