Because Flickr galleries should be bigger.
Example: http://www.flickr.com/photos/tedconference/sets/72157612974776665/
To see any gallery in phlickr_gallery in one click, put the following javascript code into a bookmark:
javascript:location='http://phlickrgallery.appspot.com/?url='+escape(location)
A quick, dirty script brought to you by seriot.ch.