Once you are on their mailing lists, it is hard to get off!
I donated money to a Campus Crusade guy about 15 years ago. I was the leader of the Christian Employee Network Group at Compaq (and subsequently HP) and we met on several occasions. But I eventually stopped the support because I wanted to channel it elsewhere.
But I’m still getting updates from him in the mail!
I contacted him twice to have him remove me from his distribution list. Nothing happened, so I started just throwing them away unread. We moved in 2003, but he somehow got the new address (I didn’t give it to him). Then we moved in 2009 and the mail still kept coming. We moved this year and I just got an update. Argh! What a waste of stamps.
This is why I primarily support our local church and then a handful of other carefully-selected charities. I’d rather give more to fewer organizations than a little to many of them. I am good at saying “no” to the little requests (grocery store checkout suggestions, general solicitations, etc.). I treat it like I do my retirement investments: I want to diversity a bit but not too much, and I want to ensure that my money is going where it can do the most good.
So my advice is to do the same: Give, because giving is fun*, but do so with discernment.
2 Corinthians 9:6–7 The point is this: whoever sows sparingly will also reap sparingly, and whoever sows bountifully will also reap bountifully. Each one must give as he has decided in his heart, not reluctantly or under compulsion, for God loves a cheerful giver.
*Oh, and give because Jesus promised rewards, and He has the most credibility of anyone in the universe to back up his promises.
Matthew 6:19–21 Do not lay up for yourselves treasures on earth, where moth and rust destroy and where thieves break in and steal, but lay up for yourselves treasures in heaven, where neither moth nor rust destroys and where thieves do not break in and steal. For where your treasure is, there your heart will be also.