I get so much stuff that I would go broke sending donations to all . I think once you make a few donations your name might be given to other organizations in the hope you will donate to them also...just can't do it.I donate to only one organization because I do know where the money goes but most of the time I never get anything from them asking for a donation, I'm so used to making out a cheque every January that it's become a habit.
When I get something that is useful I use it but don't send a donation-- if it's something that will collect dust I throw it out. Nothing to feel guilty about since I didn't ask for anything.