To be listed as a Viper Owner on the site, all that's required is a VIN that matches to a Viper. As far as permissions/access goes it doesn't buy you anything, but there is no way to truly validate whether someone owns a Viper or not.
When I was a young boy, I wanted to wear around the house some medals my Father had been awarded in the military. After telling me that wasn't allowed, he explained to me that the medals were something you have to earn to wear. I kinda got it then, but now that I'm older (and have served myself), I understand.
There will always be some who don't get it, and pretending will always be ok. No way to stop 'em without conclusive proof to the contrary. They'll expose themselves in their answers, as you have suggested.
ETA: And 00prowler, you're not a Viper owner either....at least that's what your profile says.

I can fix that for you if you'd like, just let me know.