I love the stamps on the Camino - for me they are part of the journey. As you said, they remind me of a place I stayed, a church I visited, or a cafe where I had a meal. Most of all, they remind me of the people I met in those places. On my first
Camino Frances from St. Jean Pied de Port to Santiago and on to Finisterre, I filled two credentials and even put pictures of the credentials in my blog. On my second
Camino Frances, I brought two credentials with me from the Confraternity of St.James which I think had spaces for 72 sellos each, and had to get a third credential between Ponferrada and Villafranca. I was getting 4, 5, or more sellos each day, At the pilgrim's office in Santiago, the person looking over my credentials said, "it appears that you like the stamps." Yes, she was right.
There is a web site documenting the sellos called Los Sellos del Camino,
http://lossellosdelcamino.com/index.php. It is a lot of fun.
Buen Camino!
--jim--