jslbinary is 1.6 MB. Considering the number of bundles that ships with TextMate, the size/benefit probably could not justify it.
There is a need for better being able to share user bundles, for example by publishing them from within TextMate. Other users should then be able to subscribe to it just as easily as subscribing to an RSS feed.
While I am not (currently) involved in the BundleForge project, I am hoping it is laying out the infrastructure required for this (one would need to publish to a server, from where other users can then subscribe), and it is therefor good to have a few bundles on the site for potential future testing :)