Why we collecting for other churches needs?

Someone asked me, "why do we collect offering to meet other churches needs when our own church has needs?"

Good question I suppose, I don't really understand too...why did the old lady in the bible gave those finance she had when she had so little, she had needs too?

I asked myself this question, "Why must I give you a present on your birthday or Christmas when I have need to buy a new shirt for myself?"

Guess I choose to bless because I love, love God, love others. The principle of giving applies........