Well, that's one of the real problems with vouching. It's a very serious shortcoming of vouching, you're absolutely right. It's an even larger problem with restrictions on vouching that were put in place in the last round of amendments, whereby you can only be vouched for by somebody who resides not just in the same constituency but in the same little polling division that you're in.
This makes it very difficult, because someone who's truly homeless may not have anyone who is qualified to vouch for them. People who know them—for example, who work at social service agencies—likely live in another part of town; they don't live in the Downtown Eastside. So you're absolutely right, and that is one of the inadequacies of vouching.