what are the pros and cons of running in single user?

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I have a machine running 4.10-STABLE that will be a dedicated gateway 
with a router/firewall combo and web server plus mysql server (maybe). 
What would be the pros and cons of running this system single user? 
Processes that run under their own uid, would they be able to run?

Just curious. Any extra thoughts welcome.

Thanks,

Alex

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  Alexander Sendzimir (owner)                    802 863 5502
  MacTutor: Apple Mac OS X Consulting       info at mactutor.biz