my experience is that non-profits are just as niggardly as ordinary businesses are, if not more so, but there's no incentive for the organization or its employees to do any better... nothing ever has an upside.
I'd suggest: stingy, greedy, or others - http://www.answers.com/topic/niggardly
That said, I would like to think that on this particular forum such concerns ought to be minimal, at best.
If there is some fool out there that doesn't understand the difference between the word "niggardly" and the "N-word", they should be educated, not placated.