The problem with all these tipping services is always traction. There is no pain point for the consumers of content that is going to drive them to install a bookmarklet like the one he suggests. This especially applies since all of these services are unknown.
I would love to see an already established player like Disqus attempt something like this.
They already have a credits platform, traction is obviously not an issue, and their stupid "like" button is ubiquitous. It seems to me that they are poised to solve the micropayments problem that so many others have failed on (Beanz, etc).
I would love to see an already established player like Disqus attempt something like this.