Why I Don’t Do Sales On The App Store

Isn't it a bit contradictory:

"All I get out of a blind code giveaway on a social media site is a lost sale."

and:

"In most cases, people claim codes because they like the idea of getting something for free, even if they have 0 intention of ever using it."

How is giving your app to someone who would never by your app a lost sale? To me it makes sense to give away promos every now and then. True, not everyone will use it, and yes, maybe someone who gets it for free would have been prepared to pay for it. But maybe the onces that start using it have friends who they show your app to. Friends that like your app and buy it. And maybe they have friends too... So you give away maybe 20 "copies", but since this costs you nothing, every sale this gives you counts as profit!