Yes, you can think, i´m little crazy in the subject of Dire Straits "Artifacts", but i like such documentary-items for my DS-MK-collection as well, as autographed items, records from all over the world, photos, posters, and so on.
Now i have received Jack Sonni´s High-School-Yearbook from 1972. Funny to see all those young guys and girls, incl. Jack Sonni.
I have never bought it, if there is no prominent person included, but i think some other collectionists are also interested in such items. Yes we can discuss it to death, in case of making sense to buy such items, but i can take responsibility for such purchases for my private collection. Same subject as the thread with the limited Gibson-MK-Model-Guitar.