Often, the act of paying a few bucks online is sufficiently annoying (fill in billing address, think of a username and generate a password, fish out my credit c

Often, the act of paying a few bucks online is sufficiently annoying (fill in billing address, think of a username and generate a password, fish out my credit card because I forgot the CVV2 code, wait for several page loads, etc.) that I would rather avoid it even if I don't mind parting with the money. On the other hand reading an ad and typing a few words sounds comparatively non-stressful, unless it is an overly long video ad.