Most people here are in the hobby...and you probably won't get an accurate figure because of that. If you target TV shows, celebrities who don't have the time but would enjoy a tank, and large display tanks in public areas - libraries, car washes, hospitals (my friend is doing an $8,000 doller setup next month for a local hospital), etc, you will get people to pay way more.
This same friend has a Rap artist who drops 500-700 a month easy on his 200 gallon tank. He's always getting new fish, new equipment, and when he gets bored, removes fish that are "boring", and my friend then resells them to other people who don't change their minds so often.
It's slow to start though - most of it is word of mouth.