FranticFish - 10:26 am on Sep 16, 2013 (gmt 0)
I surely don't see how many small businesses/webmasters can inspect the backlink profiles of not only their sites but also of everyone who links to them
Not for free, I'll grant you. But there is at least one tool gives diagnostics on bad link neighbourhoods (and it's also currently offering a free trial).
This is Google's mess, for sure. But in an eco-system where you are held responsible for your IBLs then checking your profile makes economic sense.
Added: just to be clear, I'm not affiliated with ANY link databases :)