Target Market

I was just thinking this morning, as I slathered on more CeraVe cream, that eczema sufferers are such easy targets for marketers. Whether you sell the latest cream, lotion, potion or snake oil -- an eczema sufferer will most likely try it, because they(correction: WE) will try anything for relief. There must be a study out there that measures this market - the how many millions or billions of dollars spent worldwide OTC eczema products. What's your guess?