@Wiggly Because 80's SW action have had zero decline proves that not everything exists in a bubble. It proved my point. Because the have yet decline, doesn't prove your point. Desirable Silver and Golden age comic have yet to decline in value. Pig and beanie babie are examples of collectibles that existed within a bubble as bubble exist for a very short period.
I sold my Video Game shop in 2008. The escalation and demand of retro gaming had long since started. In 2003, I was selling Mike Tysons Punch out, Castlevania, Contra, Mega Man, etc... For $5. By 2008, I was selling them for $15. So, it's well past the point of calling this a bubble.