Just under two years ago, in July 2009, Google announced the ability to sell or rent property through Google Maps.
Why is the real estate feature being removed? Lack of use. The feature just didn’t get as much pick-up as they had hoped.
This can be true for any Google product they put out.
For example, Google shut down Lively back in 2008 because it wasn’t getting the traction they had planned on.
This is a wise decision as with any business, you shut down or close the features/products/services which aren’t getting enough traction or generating any revenue directly or indirectly.