[ggggtez]

There is a point to be made, but you've made it all wrong.

You could argue that the $2000 transaction is actually validating all previous transactions... which sure. I will grant you that.

But by that reasoning, you need to amortize all future purchases as paying for part of the Game of Life transaction! If you do that then the cost of the transaction approaches INFINITY DOLLARS as time goes to infinity!

Obviously, this way of looking at the cost of the transaction is useless to the point of being meaningless. So let's stick with $2000, which has a clear meaning in reality.

[Taek]

The security isn't there to protect historic transactions, it's there to protect the holdings of current holders. If I had a bitcoin at one point and no longer have that bitcoin, I'm completely indifferent about the security of the transactions involving that bitcoin because it no longer impacts me.

Also, the cost per transaction - even if viewed through that lens - does not approach infinity as time goes to infinity because there would be an infinite number of transactions as well.