i am sorry but i have to agree, to many peeps are happy to have a good rumige under your bonnet and sometime have there hole arm in there!
its just comon sense dont touch anyone elses car without the owners permition,
its a shame but when i am not with my car at a show when i will close the bonnet,
fingers leave grease marks and rings scrach,
if you just spent a week prepering the car for concourse, it would not be welcomed.