It's not weird at all. I've been to many estate sales and have seen the same few people buying up old photos and large private slide collections.
I asked one buyer just why he always buys these photos. He said he looks for photos of original vintage cars and classic bicycles, toys, motorcycles, exc.
He sells these pictures on eBay as some like to collect these vintage original pictures of said items. That is what people want to buy. He doesn't get much for the pictures, maybe a few bucks but this guy had paid $20 for about 3,000 photos that day. These pictures were mostly from the 1940's-70's
I do see this Chestnut Weber Grill photo being purchased from someone on this site.
Here is another one from the same seller of that chestnut.
Sent from my iPhone using
Weber Kettle Club mobile app