I don't pre-wash my fabrics, unless they're batiks, unless the fabric is going to be used in clothing. I starch everything that I'm going to be working with, at least 2 hours ahead of time, stick the starched fabrics in a ziplock baggie, when the minimum time is up, I either put it in the dryer or if I have the time I'll "hang" the fabrics across my ironing board.
A lot of people don't like starch because it gunks up their iron and flakes all over the fabric, but, that's because when you’re ironing, you're ironing the starch. not the fabric, doing it this way, I've never had a problem with the iron getting all gunky then, I do spray mist with water since I don't use the steam on my iron.
A lot of people also say that if you use starch, you'll get bugs, I've never had a problem with bugs and have had starched fabric in the drawers for at least a year, so, if you have problems with bugs, in particular, silverfish, then I wouldn't leave starched fabric around, but if you don't have a problem, then simply because you have starched fabrics around, doesn't imply that all of a sudden you'll have a problem with bugs.