Reach and Spalding Pages on ebay

[bn2cardz]

I have noticed in one of my ebay search emails that an abundance of pages have been showing up the last few days. I finally decided to see who was selling them and if I can track it back to the original books.

I have found this seller:
http://www.ebay.com/sch/Vintage-Spor...%7C1918%7C1920

Has bought some books recently. Some of them look like the pages are falling out as in this one:
http://www.ebay.com/itm/RARE-Vintage...p2047675.l2557

Another looks like it is still intact, but is missing both the front and back covers:
http://www.ebay.com/itm/RARE-Vintage...item5b059cba67

But this one seems to have the cover and is intact. Granted the front cover is ripped, but that is the only "structural" flaw that I notice in the photos:
http://www.ebay.com/itm/RARE-Vintage...item5b059d29ad

Often I see the people that cut these up say that it is better to cut them up then allow them to fall apart. I can see book number one being split up because the pages are falling out anyways, but by book three it seems like the book could have been kept together for some great amount of time. So at what point is the damage enough to say it is beyond keeping it as a historical book and instead split them up into "collectible pictures"?