Seems a bit harsh to sell these considering copies of The Avifauna of Hong Kong were being given away recently (?).
I don't fully appreciate the dynamics of how websites operate particularly with regards to storage space, downloads etc., but surely there must already be large quantities of space already being taken up in these BBS pages by way of multiple photographs of the same bird or average pictures of common species which could be put to better use? Whilst many photographs are of terrific quality and do allow further examination of a variety of bird species, it must be said that there are a lot of mediocre postings out there too.
Recently a good example of how these ID guides would be useful is from the following discussion
http://www.hkbws.org.hk/BBS/view ... 7264&highlight= with the Dusky/Yellow-streaked Warbler where mention of an ID paper in the 1994 HK Bird Report is made (in the birdforum thread -
http://www.birdforum.net/showthread.php?t=132764).
Anyway, just my thoughts.