FranticFish - 9:05 am on Feb 26, 2013 (gmt 0)
Some more where money has changed hands...
e) links that come from being an exhibitor at a conference
f) local chamber of commerce
g) professional body / trade association member directories
Reading more around the recent high profile penalty, the site involved had participated in sooo many different types of blatant link spam that it was a wonder they hadn't been slapped before.
Personally, what I do that involves money changing hands is so different from ANY of what they were doing that it won't change the 'link buying' part of what I do one bit.