I don't think any ftp client uses STAT by default, so I would say 99%+ of the users on a FTP server uses LIST.
ioFTPD is designed to optimally handle thousands of simultaneous connections. The target audience is not FTP servers with only 3 simultaneous clients. When you have thousands of clients, the chances of LISTs occuring at the same time as RETR is pretty high I would guess.
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