To me, it's not about shrinkage per se although that's a good reason on its own. It's about all the chemicals and who knows what else coming from (usually) Asian countries. It's about fabric bleeding. I've had LQS quality fabric bleed horribly. It's about killing off any critter eggs like bedbugs and even maggots! It's about knowing what the final product will be like ahead of time. I want the best control of my project and I guess control is my main reason.