When we got married, (12 yrs ago !!), we didn't include the list, and assumed that only those who wished to buy a gift would approach us and ask if there was anything in particular we wanted.
Instead, we heard thro the family grapevine that people were annoyed with us that they had to approach us when we were so busy. I hadn't even considered that, and felt quite hurt. Also, I felt that they were assuming that we expected a gift,we didn't, we just wanted them to help us celebrate, gifts were an added joy in my eyes.
As it turned out, we got so many duplicates we spent weeks having to change things, and then upset an aunt because we returned her gift (it was easier to return hers as we saw her lots then, and were able to ask for her reciept, the other people lived 200mls away, not so easy!)
Now, I love it when I recieve the list with the invite, and am not at all put out by requests for money either, it makes it easy for me to sort a gift, and I know they will appreciate and want what I gave.