Why not is my thinking. Shower Caps have been around forever, but alas they often are the cheap disposable plastic ones with elastic that battles to create a firm fit at the best of times. These days people are more conscientious of not being wasteful with plastics in particular (think how mindset has changed with plastic shopping bags for instance).
So an investment in a decent shower cap that is made to last is move in the right direction. So Pretty Shower Caps are quality and hand made, and this is the huge difference with them if you were to compare with the economics of continually replacing a disposable shower cap. They look gorgeous too, even whilst not being worn! A pretty hair accessory that compliments any bathroom (or personality for that matter!)