on a sports car level its not horribly expensive to run, but if you were to compare it to a fiesta then yes it is expensive to run. the areas you have mentioned will all help to reduce the over all cost. remember when this was new it was a 30k car
fuel is only an issue if you do high miles if you do less than 9k a year its not to bad.
parts; they can be cheap and they can be expensive, the old rule of thumb "you get what you pay for" is very apt for the zed.
enjoyment, well you'll get lots of that. its a great car; great to drive, great balance, and very rewarding.