The unfortunate truth is that Westerners (especially those new to Dharma) usually don't give anything near enough to cover costs unless requested.
The Tibetan Buddhist center I was a member with back in Canada managed to raise money via an annual bazaar, though it wasn't that much. In the long-term they managed to secure various forms of not-for-profit funding by focusing on teaching meditation classes and courses related to Tibetan culture rather than being specifically a religious organization.
It seems though if you want to get steady funding you need a nice building. You can't use a basement or some old house. However, to build such a temple you need substantial cash up front, especially in a western city where property and construction don't come cheap.
I believe though once a warm community is established people will feel compelled to donate time, resources and part of their earnings to it as they get a lot from it in the long-term. We just don't see so much of that with westerners as of yet (at least compared to how immigrant temples operate).