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5$ sounds waaaaay to much to me!
Marketing is really not about traffic (advertising is but should only be used as a part of marketing - in other words: if enough player stick around).
You should be more creative in the ways to promote your game, much cheaper ways. Player references are a much more powerful and cheaper way of getting players. So you should put your money in building a strong community instead (in good community tools or holding contests with prizes, ... ). Be creative in finding other ways, because there is much more than expensive advertising!
$2-$3, but is was still too expensive so I stopped doing it anyway.
then don't preach about what you feel is to much or to little
5$ is too much because you can built a school in Africa for $12.500