I got a PS4 around Black Friday last year, but because none of the games I wanted for it were out or releasing soon, I decided to sell it after rumors of the PS4 NEO (Pro) came out. I got a pretty $325 out of it, and kept the game that came with it. (Uncharted Collection)
All in all, I only lost $34 on the whole thing after having it for almost a year and playing it quite a few hours. Glad I sold it before the value went down.
The PS4 Pro is releasing right around the same time as the exclusives I'm waiting for anyway - Last Guardian, Gravity Rush 2, Persona 5, etc. - so it was a no-brainer for me.