Marketing 101. And they're good at it.
Salt is salt. The rest is local minerals, so all that matters is that you find ones you like.
Our favorites have been a number of different small-production Fleur de Sels from the Camargue, in France, Le Saulnier being one of the most widely available (but still small, hand-raked production, not industrial, like Maldon). And Camargue was producing hand-raked salt for over a thousand years before Maldon was distributed, or the northern French version, from Brittany. You really need to visit the Guerande and Saint-Nazaire area and taste the local food...superb!
Snobbism is its own reward!