The end for which we work is important. It is important to get ingrained into christian college kids' heads that they are working for Christ, not for themselves. The primary end of their labor is not to stock their 401k early and often, it is for Christ. That means everything. That means you tithe before you buy the new 3 series.
It's possible most people will land in between. Proverbs also says a godly man leaves an inheritance for his grandkids. No one here is saying we should buy all this cool stuff before we tithe. I am simply saying a good Christian life doesn't have to be on the extremes like Piper and Chan make it out to be.