[CentOS] Suggested yum priorities settings for 3rd party repos

In the  yum priorities page on the wiki Akemi Yagi suggests 
http://wiki.centos.org/PackageManagement/Yum/Priorities

[base], [addons], [updates], [extras] ... priority=1 

[centosplus],[contrib] ... priority=2

Third Party Repos ... priority=N  (where N is > 10 and 
based on your preference)

If you have rpmforge, kbs, epel all set up at 10 then wouldn't 
those also potentially overwrite each other if the same package
exists in all of them?

Who has got several 3rd party repos and what are your yum priority
for those?

Regards,
Vandaman.