Actually that is NOT the point in Vancouvers case. Vancouver draws 5000-7100 per game in a 7100 seat stadium. Fans in Vancouver do go to games.
Here is a quote about Vancouver fans from a former A-League coach done for a-league.com as part of a season preview.
PROS: The Vancouver Whitecaps' fans. Easily the most sophisticated and knowledgeable soccer fans in North America. How many other fans really applaud and show respect when the opposition demonstrates quality soccer? The Southsiders should be paid by the Whitecap's ownership to show up to home matches. What comes out of their collective mouth is sometime just pure genius. Can anyone remember "Popov" and "taco" being repeated by the Southsiders at a frenzied pace? These fans create an atmosphere that is the closest things we have to a Europe, or other true soccer fanatic countries, and are responsible for making Swangard one of the "magical" places to play soccer. If you're afraid to play at Swangard because of the Southsiders you are in the wrong business! If more of our players would play under these conditions more often, professional soccer would be better off.
Another interesting quote:
"CONS: Are the Whitecaps in financial troubles? Does the current ownership have a real and serious understanding of what it takes to be in professional soccer? Was it the past management or the current ownership that is responsible for all the off-season commotion?"
I think the answer to that question is that current ownership can't tell what they are doing with their heads up their you know what.