Real World Terrain can generate:
Heightmaps up to 10 meters per pixel;
Textures up to 0.25 meters per pixel.

In the product description on Unity Asset Store these items are marked with different signs ("•" or "-").
But I think you're right. It is quite easy to miss, and get the wrong opinion about the product.
Thank you. We'll fix it in the next update.

Here on your webpage it is a lot clearer that those are actually just satellite images, and Bing is your best heightmap resolution at 10 meters.

Elevation Heightmaps:

    Bing Maps resolution of max 10 meter per pixel.
    SRTM v4.1 resolution of 90 meters per pixel.

Satellite images resolution of max 0.25 meter per pixel.

The indentation doesn't come across on the Asset store. I would suggest moving that last line to a totally different part of the description so you don't have people angry that their heightmaps aren't good enough.

Unless I'm mistaken and you really DO have .25 meter heightmap resolution, in which case I'll buy immidiately.

Take care