In a game I have in mind the player would earn points and sometimes earn/pay money is this possible in a rpg gamebook format?

Yes.
Oh, gamebook... I would think so...
Text Adventure can do gamebook, but you have LOTS!!! more "toys" to play with.

This is a very simple addon and may be implemented with easy. Try checking documentation for variables. All you need doing is creating the variables player.money and player.points. when time comes, you may increase and decrease this variable as needed. If I recall correctly, the GUI only allows you increasing and decreasing by 1. So you need to, for example, set player.money = player. Money + 5. So you may increase +5 , for example.