Big part of it IMO. In combination with the incredibly knowledgeable posters here, there's a good humoured approach to posting and moderating. Some of the other boards on FT are moderated in a way which doesn't allow for any 'fun' whatsoever, whilst a typical BA thread, once the question has been answered, will see the full gamut of sarcasm, slapstick, and pun-based British humour.