It depends where "overseas" is. Do you really think Rome, Paris, etc. are a big deal to Europeans that are close and can get there cheaply and quickly? Toronto is obviously not first in mind as a tourist destination, but it's not surprising why they'd want to visit. It's a fast rising cosmopolitan city with much to offer.
Hmm...Distillery, Chinatown, UofT, Kensington, Yorkville....
I find Torontonians can be incredibly down on their city and what it has to offer. Many have so thoroughly convinced themselves that there's nothing worthwhile here I wouldn't be surprised if they're one of the reasons people wouldn't want to come.