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Get them addicted to your textboard, adjusting their expectations such that they can't focus on books without medication. Then offer to sell them medication like methylphenidate without prescription. This is only the first step however as you'll quickly exhaust supply. At this point you want to transition to a MLM model, allowing your drug addicted readers to pay for their drugs by bringing new customers. The proven way to do this is to use social obligation, say a sort of book club.