Even though the typical person may have a large number of PSA's, the percentage that are active is much smaller.
I use the Team mailer for the masses. For those that respond, I will further filter between those that like help, and those that don't, which cut's the number needing your time even more.
If you have large numbers needing your help, rejoice, because you are doing well!
Time management is a self-discipline that you can master as your Team grows. Good luck!