ARIN

   If we are talking about switching our network infrastructure to
   native IPv6, even just the cost of figuring out the cost is not
   insignificant. Off the top of my head, I would need to factor in:
   ...

   Now for all that cost/effort.....what EXACTLY am I supposed to be
   gaining in terms of benefits out of IPv6?

You get to stay in the game.

Without such investment, you're out.

Craig