Performing a "clean install" of 10.6 as routine maintenance?

Does anyone regularly wipe out their entire Mac OS 10.6.8 and perform a "clean rinstall" as part of a routine maintenance regimine? I was always told an OS reinstall was overkill, unless you were having issues that could not be resolved through traditional trouble-shooting methods, and that it wasn't something that was necessary to do on a regular basis. Considering how much time it takes to reinstall the OS and upgrade all the apps to the latest versions, is there any new reason I'm not aware of as to why someone would need to do this for 10.6.8 on a regular basis in a work environment if they aren't experiencing any issues? Thanks for any opinions.