(admittedly informal and non-scientific) market analysis right now. I'm asking people whether they would buy a particular product if it was made available in a particular marketplace. The people seem to be saying yes, yes we would, which indicates market demand.

The fact that people buy it off campus doesn't mean there is no demand.

Take an example - US companies want cheap labor. They can't get it in the US, so they go get it where it is offered (Mexico, China, etc...). The fact that they are getting what they want somewhere else doesn't mean that there isn't a demand to have it in the US. There's still a demand for cheap labor in the US and companies would prefer to have it here. But if they can't get it here, they'll go somewhere else to get it.