To prove it just open a commercial model at random and study the mesh.
Part of that is just advertising.
Most of the time, when a model is advertised, it shows the mesh as rendered, then also as wireframe.
A nice looking wireframe makes the model look more desirable.
Of course, if a model is to be animated, the topology is very important. But If the model is a static model, it´s much less important.
But the model with a beautiful mesh would probably sell better than one with an ugly mesh, even if they both render exactly the same.
If I modeled something in a NURBS modeler, then I wanted to sell it as a polygonal mesh, it´s not going to look that good, compared to a model that was modeled in a polygon modeler.
Another example. If I sculpt a model using a sculpting program. I could just export it as is and render it. It would look great.
But if I wanted to sell it, it would need to be retopologized, so that it had a nice mesh.
The point is, when you are creating your own art, it´s the finished result that matters.