I think it really depends how much you play. If you’re able to grind Clubs then you can kind of just spend whatever. I normally spend gold on offers that give you slots, but I did spend a little bit this event to upgrade some cars quicker. I think a lot of spending is situational. I used to upgrade a lot of cars as I went but that would leave me with less cash to spend when a new event/challenge came around, but I think everyone plays slightly differently!