reusal of address(privkey) and the random parameter k can cause trouble

Bitcoin POS mmmm that would be nice and allow much more people to "mine" which (I think) it was one of the beauties of Bitcoin at the beginning.

Not really. 1 bitcoin is 1 bitcoin, there have been attempts to make a certain denomination the main one but all failed or didn't receive enough adoption. Knowing that, do you really think that people would agree with such a major change as moving the decimal point when they don't even agree with the adoption of a certain name for a denomination? Worst case scenario is that a standard unit could be introduced but there's no guarantee it'll start being used by most users.

The real gamblers are those who are not worrying how much money they had spent on it because they have a lot of money even there's already a big loss. Anyway, I do believe that sports betting is really having the high chance to make profit other than any gamble games.

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No doubt bitcoin is growing by year.2017 would be better for bitcoin than 2016 and 2018 far better than 2017 and so on