When I ran a lfs I had a 4ft display tank with goldfish with a small note saying how they really needed this space. We sold mostly fancies but had a few normal goldfish for the pond season (the extras at the end of the season came home to my pond). As I was very much a hobbyist and ran but didn't own the business, I turned so many people away when they said they had a small tank. Some I convinced to upgrade to tropical and onto neons, guppies etc, others went temperate with danios but often I got looked at like I was mad and they simply went to the next shop.
So at the end of the day I applaud any effort to educate but many people just don't care, they want their fish and will happily lie to get it. It's not just beginners either, I've heard porky pies from every level of the hobby.