For advertising to be beneficial, you either use an automated service like Adwords, which will spit out Acne related ads for rubbish that doesn't work. Or to manually manage ads, we would need a sales rep to make it worthwhile. And even then, I am not convinced that adverts unrelated to acne, are of benefit to our visitors. Or that the advertisers would see a good return on their investment. Plus their are also implications with the search engines.
For what its worth, I like that you're suggesting ways to make the products cheaper.