Well, I guess there is more than 1 reason to use 775 instead of 755.
Anyway, lets say you have a script which writes a file to a directory. Your FTP is probably running on a different group than your webserver is. If so, it's possible that on some servers the script won't be able to write to the directory if you run it from a browser. Now you could either chmod this directory to 777 to make it writeable or you can 'chown ftpuser:nobody' this directory, if your ftp is running from ftpuser and webserver is nobody, and then chmod it to 775 and it will be writeable without having to chmod it to 777. And 775 is saver than 777.
:-)
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