people can install apps easily with the installation tool of their distribution. No need to deal with tar balls. If they think they need a tarball - it helps to.. you know, use it from the original homepage, not some russian blog. And zeroinstall helps you what? hm? which problem does it solve? none that could not be solved better without that really bad crutch.
Also I really recommend you these two links:
read and think about it.