Craigslist

So I recently bought a pair of rayban shades off of his guy I know for 30 dollars. Searched the model number and saw that they cost 180 new. Decided to sell them on craigslist. No one was buying them for the price I wanted so I let them go yesterday for 60 bucks. Figured heck I doubled the money I put into the shades. Took the 60 bucks and got back on craigs and refreshed the electronics section and wala, someone was selling a galaxy tab 2 for 70 bucks. Asked him why he was selling...said he needed the money for a phone payment. Told him I had 60. He accepted the offer and now I am selling the tablet for 130. :)