What do they gain by doing this.

I don't get it.

You don't say you won a block until you win 2 in a row... OK.

You win and tell everyone and then win two in a row.

You get the same reward. Do you some how make your odds better at finding the second block? It would have to give you 2x as good odds of finding it if you are willing to lose the one you found.

If you don't find the 2nd block before someone else finds the block you found and you lose it.

I'm just not seeing the advantage gained.