2 billion that is.
Of course it is arguable on how many computers to add each year, and about how fast they are going to get.
But even if you let is grow in a few orders of size, the point of my explanation stays the same. It is just too hard to do.
Yeah, the sheer magnitude of the number of values that need to be checked means that a few orders of magnitude isn't going to change much/anything really in the grand scheme of things. I suppose the people who are bothering with this are hoping to get lucky, but I'm pretty sure their chances are lower than winning the lottery 10 times in a row just to give a little perspective.