There is no basis for any lawsuit.

It’s perfectly OK to discuss public transactions.
People have been doing that since the founding of America. The Net is like a townsquare.

The only hassle would be to respond to a lawsuit.

http://lajolla.whoboughtwhat.com/news/?c=1.2009

Remember the Ummel case?

If Realtors can’t be sued (successfully) for pumping up the comps, then bloggers who bad-mouth a neighborhood can’t be sued either.

If I overpaid, I would sue the appraisers who may have used comps which were fraudulent to justify prices. The Ummels actually settled with the appraiser.