As mentioned in #1, you are going to implement an additional feature that solves a very serious threat to mankind:

what if VIM opened again and again and the horror of having to press the button followed someone forever.

And such a heroic effort cannot go unrewarded. So, I think it is fair enough to double the price to one million dollars.

But if in an act of magnanimous generosity you decide to charge less, the minimum price could not be less than 750.000 USD, in my opinion.