Logic doesn't apply in this case. If I donate money I am acting against logic.
My self interest benefits more if I use the money for myself rather then giving it away and getting the benefits in a form that is heavily diluted. It is the aggregate donations of people that can, in the end mutually benefit my self interest. However my individual donation is just a drop in the bucket; I stand to benefit the most by not donating and letting others donate. Thus, the logical move is to not donate. It is actually counter intuitively detrimental to my self interest if everyone acted this way. Garrett Hardin described the paradox in his famous paper:
This does not mean I think it's ok not to donate. A large part of our lives as humans are not dictated by logic. What I meant in the original post is that from an emotional standpoint I just don't feel a heavy burden that I need to donate. $20000 that could be a donation I'd rather spend on a worthless luxury (i.e. new car) for me... and that's not logic talking either, it's just my gut, emotional desire.
You said it yourself, "worthless luxury" is worthless. Your emotional desire once met will be only be temporary before you desire the next thing. It's an endless consumption cycle which will leave you feeling empty inside but with a garage full of junk. Donating to noble causes would have you the reverse of that.
My self interest benefits more if I use the money for myself rather then giving it away and getting the benefits in a form that is heavily diluted. It is the aggregate donations of people that can, in the end mutually benefit my self interest. However my individual donation is just a drop in the bucket; I stand to benefit the most by not donating and letting others donate. Thus, the logical move is to not donate. It is actually counter intuitively detrimental to my self interest if everyone acted this way. Garrett Hardin described the paradox in his famous paper:
http://en.wikipedia.org/wiki/Tragedy_of_the_commons
This does not mean I think it's ok not to donate. A large part of our lives as humans are not dictated by logic. What I meant in the original post is that from an emotional standpoint I just don't feel a heavy burden that I need to donate. $20000 that could be a donation I'd rather spend on a worthless luxury (i.e. new car) for me... and that's not logic talking either, it's just my gut, emotional desire.