I mostly agree, and dual boot Tiger and Leopard on my 1.67GHz PowerBook G4. But just as those OSes aren't very useful outside of novelty (or maybe some older Mac OS games that haven't been ported to a newer platform) so is running a modern Linux distro or BSD on it. The times I've done it, I've done the install, clicked around for a few minutes, and then move on. Sometimes struggling with and overcoming the hassle of installing an OS (or newer version of Bash on 20 year old Mac OS X) is the point. Journey vs destination and all that.