This sounds like a great idea for Toronto -
Here on the West Coast, there seems to be a huge and growing interest in sustainable living but in terms of real estate, indeed there is still a lack of "green" developers. Not everyone wants to pay more for a green home but there are certain areas where residents are serious about protecting the environment. Perhaps you could seek out these areas/neighbourhoods in Toronto to target first so they can be your influencers.
If you look on BuiltGreenCanada.ca you'll only find one developer in Ontario listed but BC and Alberta have a decent list of developers who build to Built Green standards.
http://www.builtgreencanada.ca/find-a-builderSustainability is one of our core values at Adera so we are certain to give back to the communities we build in (we call it the Triple Bottom Line! Finanacial, Personal, and Social benefits). At first, some home buyers don't express interest for the green features but once they've moved in and experienced the benefits they are more likely to consider green features as part of their decision making when it comes time to purchase a new home in the future. Educate your consumers so they they will believe in the product, experience it and hopefully become advocates for the environment too!
GreenCondoLife sounds like it has potential to grow! Sustainable living and awareness is growing, as well as the need to protect our environment and planet for current and future generations. It's not about selling a product that is "good for the environment" but instead the importance lies in changing how we think and live our lives and influencing others to take part in this movement.
Good luck!