I'm not sure why the parent is downmodded - it seems to me that $15 is indeed a relatively high price tag for something that seems like a single feature of a graphics program, albeit a useful feature.
People who take a lot of screenshots are willing to pay for convenience. SnapzPro has sold a ton of licenses at $69 for example. I just sent this app to my dad, he writes computer books and screenshots can be the bane of his existence--if it saves him time he'd pay 5x the price.
Update: He just wrote back, "I can't believe it's only $15!"
