Are we hanging on to cheap things when we could use them to get something much, much more valuable?
How do we give to meet needs, while still having enough left for our responsibilities?
Ever thrown a party because you invested someone else's money wisely?
If we are concerned about what people think when we give, we're probably giving for the benefit of the wrong person. If we judge other people in the same way, we can rob them of joy, as well.
If God can use an amount of money so small that we named a class of subatomic particles after it, He can use what we have to offer for His purposes.
The call for us each to contribute to the church (the body of Christ) isn't just a suggestion. The rest of the body needs each of us, from the smallest to the greatest.