Our Photopass+ was $70. It really doesn't take many individual pictures to get to that point. Not sure if that's changed since then. I'm assuming they have swapped over to Memory Maker now too?
For us it was a slam dunk bargain. We came home with prints in hand from 5 character meals. So it paid for itself really fast.
You really will be surprised by how few PP photographers you find compared to WDW. Or maybe it will be different for you since I was there in early December. Most nights there wasn't even one out in front of the castle after dark. When we were there, someone told me they were only doing that on weekends. When I got back someone else said they found one at night.
But I just can't imagine you wanting at least a few classic shots with DLR borders (especially Carsland..... don't forget the night shots on Route 66!), so I bet when you do the math you'll decide to do it.
Does your roommate have any interest in sharing one?
So glad you had a great day!

Can't wait for more updates on all the exciting things coming up in your life!