I think you misunderstand the system. It's not that you have 10 points to distribute across the candidates, but that you give each candidate a score. What score you've given to other candidates doesn't constrain what score you can give this candidate - you pick separately from the whole range for each.

So if 10 is the maximum (0-1 was the range given above, but whatevs), then sure if I prefer Hillary to Trump and they're the only two that seem likely to win, maybe I'll give her a 10. But for anyone I prefer to Hillary, why would I give them a zero? Of course I should give them a 10 as well!

Yeah I understand that. I still feel that voters will eventually converge to giving other candidates the lowest score possible because it increases the likely hood of their candidate getting elected.

edit: definitely willing to try the system though :D