Torres,
Regarding hull and third party property damage, I don't recall any instance where an insurer has denied payment of a claim but I would think the insurer may have recourse against any offending pilot, if blatant stupidity was involved.
That's pretty well what I would have hoped to be the situation also.
On a further note, to those who hire out light aircraft to pilots for pvt use. Do you have the hirer sign an undertaking that they will be liable for insurance excess in the event of a claim? I know we haven't done this yet and fortunately have not yet made a claim. However assuming someone bingles an aircraft and has not signed any form of hire contract, they could perceivably walk away from having to pay any damage or insurance excess costs.