both of your examples are invalid syntax. If you want to print the integer value then simply write your text like this:
current quiz points: <v=QuizPointsValue>
EDIT: the forum doesn't allow me to post the text I actually want... the tag in the text above always gets discarded... sorry. better look into the wiki info here: http://wiki.visionaire-tracker.net/wiki/Displayed_Text
ValueRandom is only used for the initial random value, if you need a random value during the game then use the action part "set random value".