Special gates are rare to find, but they bring a lot of profits.
Yeah, they are not free of danger, rather they are more dangerous than any other gate, but that is the case for high-rank gates.
The world knows of low-ranked special gates as well.
Although the profit from those gates is lower than the high-ranked gate, they are still much more profitable than the normal gates.
Many special gates with a rank of F, E, D, and C are found and cleared all over the world.
If it is an S-ranked special gate, then the raiders would think 100 times before entering it, after all, no one would want to jump to their deaths.
But it was different for low-ranking gates.
If it is an F-ranked special gate, then the maximum power its special boss could have will be D-rank.
It is the same for the other gates as well, the maximum rank of any monster inside the gates that had a rank lower than S was S-rank, including the special gates.