I'm gonna jump in this pool for a bit. First off, I don't think that anyone here has anything but positive things to say about your volunteering your valuable (I mean that, all our time is valuable) time to an establishment such as a drive in theatre. That being said, here comes that part that you're going to get defensive about. You just asked a buch of people who don't care about your feelings if that dress makes you look fat. The people here in the forums, at least in my very limited experience, are very willing to help when people have questions. They don't even seem to get lippy when the same question is asked 354 times by 177 people. When a question is answered and advice is given however, and you choose to argue with what they're saying, that's when it goes from advice and answers to off topic arguments.
All they're pointing out is that any cache with the intent of drawing customers into a business for the purpose of getting business for the business, it's commercial. Ultimately your reviewer will approve or deny the listing.
I don't see the purpose of your defensive nature. If you don't want a question answered or an opinion voiced, stay off the public forums on the internet.
Bittsen, I love the idea about placing a cache near a drive in. I have a drive in about 45 minutes from here, and hadn't even thought about putting one there. Might have to work on that...