By putting in facilities they will be able to host smaller campervans without an onboard toilet or shower, as well as full-size MHs. And I think that is a significant additional market.
And although your view is clearly strongly held, it is not necessarily the preference of all motorhomers.
Point made but for many of us who would like to see more 'aires' in UK one of the constant barriers is that the councils seem to believe that we need facilities and therefore its going to be too difficult and expensive to provide.