Hmmm,I guess it depends.
They mentioned it on one of the podcasts that as long as your active in the group,and your not just advertising all the time,it's all good.
Like silver sufer,he advertises his podcast,but he's active in the group also.
In discussions that say things like "Hey, Do You Like Spill? Then Join My Site!". Really, it's when new members make a discussion like that, then members go to it and say that the user is self-promoting, and then attacking that user for plugging his site.