This automatic data entry is one of SelfPromotion.com's most powerful and subtle features. There are many minor indexes out there that might only generate 5 or 10 hits a year for you. It isn't worth spending 5-10 minutes at each of these sites to register by hand, but because the extra information you have to enter to promote to one more site using SelfPromotion.com usually takes you less than a minute to enter, it makes it possible for you to register at more sites than you otherwise would if you were doing it by hand.
It wouldn't be cost-effective for you to spend an extra hour or two of your time doing registrations that might get you an extra 100 visitors a year (and maybe 1 or 2 sales). But if it only took you 10 minutes, it's a different story. Which is the real power of this site. It saves you time.
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and my current favorite, which proves my mother was right about guilt being good for you:
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