Originally comments in the Flippa blog could link directly to your site from your signature/username.
Subsequently Flippa seemed to have changed that because for a while I saw all links going to users' Flippa profiles, not off-site.
Whether it was this or some other reason, the number of comments seemed to taper off. Many of those who used to comment were siteflippers who were posting mainly to drive traffic to their sites and their products. Without the direct link I suppose the incentive to post was diminished.
Flippa seems to have now reverted to the original setup - direct links. (Or maybe I'm reading this all wrong and someone can enlighten me, but some links now seem to go off-site.)
Has there been a change in policy? If so it may be worth siteflippers starting to comment in the Flippa blog again. Do note that the links are nofollows so don't count for SEO.