Just because people didn't come to your beck and call doesn't mean there is no interest. I can assure you plenty of people in Toronto are interested in reptiles. But you must take into account that most of those people have day jobs, even herp jobs, families, etc and making it to the show alone can be trying.
Also you only "tossed" the idea out. Maybe making a more specific effort would help you? Like I said plenty of people in toronto.