I have read a lot about people getting new bikes and immediately taking off stock things and getting new, better things instead. For example, I was reading a post about someone's new bike in which they stated there was "Nothing stock except the frame left on the bike". I was wondering, what do people upgrade first and why? All I have done are pedals, grips, and seat..all for obvious reasons. I just don't understand why you would spend over 1k on a bike then spend even more on upgrades rather than building your own bike or getting a more expensive one to start. What is the first thing upgraded on a new bike, and why?