If you creat a DMZ it doesnt stop anyone else from using the internet DMZ isnt something like the only ip address that goes in there is the only one that can use the internet that is not the case all DMZ does is instead of creating ports etc it just like makes a tunnel directly from your PS3 (if you put your PS3 ip as the DMZ) to your router.
Trust me mate i made my DMZ my PS3 ip and im on my pc typing this right now. after you put it in you will still be bale to browse the internet and etc with your laptop and pc's or whatever
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PS3 Gamer 
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