Guess I'm more in minority--I keep a lot of my quilts or give to family members. Since I long arm, I often do will quilt charity quilts pieced by others for free. Since I do that and work, I don't have as much time to piece quilts for myself and family, which is why I also don't have time to piece tops for charity either.
If you feel like you want to donate quilts--go for it! Also, maybe you would feel more comfortable making table toppers, placemats and bags for your own use?