It’s even more puzzling given how many other FTP/SFTP graphical clients there are for Mac OS. Not just Transmit and Cyberduck, but also Fugu, which is open-source like Cyberduck (although it has not been much developed of late) but Fetch, which is commercial and older than Transmit (dating back from the 80s) yet cheaper at $29.
I just don’t see why Transmit is worth it with all those other options.