I don't believe the amount of user engagement entailed in Jango NeuCoin tipping or Solitaire playing is worthy of being counted as the creation of a new "user".
Adapting from user acquisition speak, I'd consider them something closer to a "lead." Whether neucoin ultimately "converts" them remains to be seen. Maybe they are or maybe they aren't or maybe they will we don't know. Every coin has a consumer education problem. Neucoin will end up with a rather large freshman class.
Most companies use the same strategy when reporting numbers. I've worked for several. Even behemoths like Facebook and Twitter report a significant segment of "zombie" users as actual users.