I did a photopass share and would recommend it. Of course you are giving someone that you don't know money and counting on them to take care of things. I paid $20-$25 to share with six or so people.
Worked great for me and I will do this again next year.
One thing I also liked about doing the share is that I am not good about finding all the Photopass people and getting the most bang for my Photopass buck, so if I only get 50 pics, I don't care. I know those that can get hundreds of photopass pics. I don't know how!