It is amusing scanning through some of the photos. He has some really amazing pieces mixed in with the mounds of garbage.
Things of note I saw, a brand new 2L16B New Astro City panel with housing, a full CPS2 SoM kit (I had never seen one of these before), multiple special edition GBAs, CPS2 Progear (if legit that is worth some cash).
Of course the nice things I saw didn't bring it even close to the half million mark. Honestly, I would have a hard time ever justifying that kind of cash on my hobby in one go. I would just think "I should pay off my house completely" well before paying that.