Seems kind of pointless puzzle if when you do find a solution someone else can just rob the coins off you by spam attacking and kangaroo attack.

So really the whole point of the "weak" keys puzzle is flawed as many people will just be waiting for the TX to hit the network then just go after that.

In essence unless your conneced to some mining pool or have connections there is zero chance your going to get a pool to include this actually you may find they try steal it from you.

And yes there are people running this stuff on crazy crazy machines so there is a good chance once broadcast before it gets picked up someone else then it's fee race and yea before in the past this happened someone ended up paying a massive fee just to get what little coins they could.

So don't participate unless your well linked up and know exactly how to do this stuff or you will get mugged for your find on broadcast.