Just to submit another datapoint...
My '05 has 80k, and had an Invidia up when I got it. The rest had been put back to stock, but I assume it had been at least stage 2 for some of it's miles prior to me owning it.
Pulled the turbo last Friday & found about a 1/16 inch axial play, but no radial. no rubbing so far from what I can see.