Why wash new quilts?

I rarely prewash my fabrics anymore if I know where I purchased it and the manufacturer...while I love the color catchers, I still use white vinegar in my wash to keep colors fast if I need to...I love the crinkly look of quilts so I wash mine as soon as I am done with the binding...I love seeing how it will turn out...I find that washing hides a lot of little mistakes as well that I might have obsessed about a bit...I make a lot of quilts for babies and families so I want to make sure they hold up well...unwashed quilts look flat to me but I think it depends on the look and use you are going for...plus, with 4 cats and a black dog, a few hairs and probably a few drops of wine or coffee are going to make it on anything I make! :D