CL ads that say "no investors"

[Ari Bachrach]

I've been perusing the local DC and Baltimore Craigslist for real estate and I see a whole lot of listing that include the following line:

> Owner Occupied Only!!! NO INVESTOR OR WHOLESALER 

Does anyone know what the story is here? Why would someone limit their range of potential buyers by excluding some of them when listing? Is this something they can really enforce? Is it just a scam to try and build a list of home buyers for a realtor? (I did notice that all the listing say "bank owned" and have no details specific to the properties like addresses, pictures of the inside, number of bedrooms, etc., which does make me a little suspicious).