the insect problem may happen if you store your starched items for long periods, for instance you are not supposed to starch your table linens before you put them away for the season. If you starch fabric when you quilt, it all washes out so you would not have 'bugs in your quilts', or left over starch either! I'm thinking that if you don't have an insect problem with other fabric items currently in your home, you probabaly won't have them when you starch your quilting fabric. I agree with ckcowl, I would be more worried about introducing oil into the fabric.