What happened to my shelf of animals?

O'Reilly has a promotion allowing you buy the online copy of any (?) print book that you own for $4.95. When I looked at my bookcase what I saw amazed me. All but two of the books I cared to have online where not O'Reilly books. Most of the books that have value to me now are from Addison Wesley, Manning, and Apress. I don't know why this is but evidence says O'Reilly books are less important than in the past -- when almost all my books had animals on the cover.