What if i got time machine...

What if i got a time machine... :) ... many movies have come on time machine, and recently i watched 'Heroes' where Hiro Nakamura can travel through time. Usually the main aim of the people is to save somebody, alter the future, find their true parents blah blah. Grow up story tellers, if i can teleport, i will just go back in time and invest in stocks. ;)