I don't think it is cruel. On the rare occasion where they are stupid enough to be zapped, it is only enough to shock them into not trying it again. Usually they sense the danger and don't even try.
The individual should ensure their own safety, however, it could work out cheaper if bought centrally and there could be an argument for individual Clubs to ensure the safety of its Members.
Well done Walter. A long partnership with the Masserella family and you have certainly brought the best out of the pigeons you bought from them. You have always promoted them and were never slow to sing their praises when you scored well with their bloodlines. Hope you so do again.