well in all fairness, if you take Lance Armstrong and put him on a Denali in the Tour De France, he would finish dead last.
If you are at the very top of the bicycle racing world, then you need a $5,000 ultra lightweight bike. But for 99.9 percent of us who are not top-class racers, the Denali and similar bikes work just fine.
And I've found, the more that cyclist spend on a bike, the more they will spend on maintenance.