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This script basically is only printing usernames ($1) and GID's ($3) with a GID of greater than 99. You might try playing with the number 99 and 100000 to see if there's a range that works for you to get rid of all the services stuff. Mine is actually more like 999 and 2000.
Once you've got that trimmed down how you like it, you can delete the " " $3 in the print command to only get usernames.
Most services such as the sshd also have a user account associated with them so that they don't have to run as root (this is a good thing, security wise). You could always check for a valid shell (bash, csh, or the like).