I think it's a great idea, it would help promote merchanting, printing.. and so on.
Personally right now I have everything I want on Zarp and I have more than enough money to buy anything else I could possibly want so I have no need to make money at all, I don't print anymore and I waste money... If there was a leaderboard it would give an incentive to go and make more money and try to be top or as high as possible... only if it was clearly shown somewhere people will see it and look at it though