Please don't down vote this guy for being "wrong". His view point is seemingly widely held and very appropriate for this conversation, even if it is not completely correct.
Then I'll add another point of view, hoping that I'm not the only one: The issue for me was not that I expected a free update for iOS 7 or a universal app, but that pulling the old app AND replacing it by a paid app with the same name was very misleading. Please name it "Clear 2", "Clear HD" or "Clear+", so that customers have a chance to understand what happened. Not everyone reads blogs.
After updating to iOS 7 (and before learning of the drama surrounding Clear), I wanted to download Clear to my phone again and almost bought it by accident: after all, the icon, app name and app platform (iPhone) were the same, so I figured that the price still being displayed was an App Store bug.
It's not that I care about paying 'a cup of coffee' for an app _at all_, but this felt like a scam. OmniGroup handled this a little better with OmniFocus: They've also pulled the old version, but the new one looks different and is called OmniFocus 2.
