For the registry you do since it's an online registry. If your bride wants to do a wedding shower though, that works without the PWS.
I guess you could have your bride send a copy of the well stocked kitchen to all her guests, but she may get a lot of duplicates.
IMO, if the bride really wants a registry, it's worth it to get a PWS. You pay $54 for six months, if you don't like the website afterwards you can cancel it again. You'll make well over $54 on a wedding registry!