The only way to get frequent users is to have unique, useful content in a focused subject area. Addons and hacks rarely help in this respect.
Although consider this: if your site is non-profit, why advertise at all? Sure, it will build the community, but it will end up costing you money and your users frustration once you yourself have to start running ads on your site to pay for the initial advertising.
I sugguest that you concentrate on content and an excellent Google ranking instead.
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