There are tons of smart Canadians due to the great education system, but Canadians in general don't appreciate success in the same way Americans do. When I quit my job to start my own thing in America, all my co-workers and friends were pumped up and excited, while many Canadians were perplexed and asked questions like: "Don't you have a great job? Don't you make enough money? Why would you quit?" They concluded there was something wrong with me for quitting a decent job to do my own thing.
They didn't understand that being as upper-middle class as I could wasn't my goal. My goal was to try and build something out of nothing and hopefully be the best in the world. Americans get that because it's part of the American dream.
If you are talented, entrepreneurial and a good hacker, get down to NYC or SF. I used to be worried about visa issues, but then I realized it didn't matter, you can figure them out as you go along.