Also, for the record, I don't think just because something is free that it's better or that it makes it ridiculous to pay for something.
I paid for Cocktail. I like the UI better and I think the dev behind it has done a really great job over the years so I wanted to support them.
I could use CloudApp for free, but I pay because I want to support the devs.
I could use Evernote for free, but I pay to support the devs.
There are free alternatives for Twitter apps, but I choose to use Twitterrific. I prefer the UI and I love the Iconfactory so I wanted to support their work.
I could go on and on, but let's not be so judgemental about free always being better (it's just as pointless as the open-source zealots or Mac fanboys).