This is a potentially addictive and risky venture. I've personally bought hundreds of domains over the years, and professionally in the thousands. I've probably broken even or profited a little. Most of the domains I buy for the name just sit there unused for 5+ years.
I don't necessarily mean as a career path. More-so as an out-of-work hobby to keep me occupied. By buying a good domain name, that would probably give me the kick I need to do something with it!