There are two main ways around this.
Here is a LISP routine to export points in a DWG to CSV file:
These points can then be imported when making a Revit topography by selecting 'Specify Points File' on the Ribbon.
RevitCity.com | Topo point does not import?
Alternatively, you can Replace the points with some other object that Revit will make use of more easily (for instance, a block with some very short lines). To do this, use the 'RP' LISP routine from the following post:
Re: Replace point with block/object - Autodesk Discussion Groups