Intended use of the mtDNA and Y-DNA projects?

Is the intended use of the mtDNA/Y-DNA projects that we should add ourselves and all our straight-line maternal / paternal ancestors to the project of our clade, to collect people interested in following a particular clade, or "none of the above"?

I find it fascinating, but I'm not sure what I can use it for.

Profiles that belong in a project:
ONLY the earliest known direct ancestor, in TESTED lines. :-)

All Users can Follow the projects as they wish, of course.

If you hve not tested yet or wonder how, what you can get out of it etc, there is lots of info here:
http://www.geni.com/discussions/80820

We hope Geni some day will implement better tools for genetic genealogy; in the meantime we have these projects.