Well I'm a bit confused at the notion that we're pretending anything, or trying to slip anything under the table. Luke and the rest of eXtv volunteered our time for this project. A few days ago, we saw the opportunity to add an optional price tag, so we did.
Did we consider a donation button? I don't think I did. You'd have to ask Luke or eXtine whether the thought hit their minds. Would it have been a good idea? Sure. As it stands now, it seems like most people here don't have a problem with the way it's currently going, but I'll keep reading the thread to see if it becomes more an issue.
As for the length, I often passed emails back and forth with Luke on cutting bits out. Wanted to make each scene succinct and punchy, without too much irrelevant stuff.
In the end, if it seems shady to offer the 50fps version for a $5 contribution, then I apologize. It certainly wasn't anyone's intent to pull a fast one. The sinister motive being ascribed to this move has caught me completely by surprise, which is why I've seemed defensive.