Yes, there are very few movie clips on Flicker.
That's because Flicker is privately sponsored by me, Scott Stark. At the moment I don't have the cash or resources to devote a lot of disk space to movie files, nor the time to manage such a project.
There are, of course, a number of sites on the web that to provide movie clips, and many of them are actively soliciting avant garde films and videos to provide to their users. Some of the more appropriate ones are listed on the Links page under Movies Online.