For me running costs seem very reasonable.
Just had my 8yr old zed serviced.
Got the bigger P2 service, brake fluid changed including MOT......£195 all in supplying my own oil though.
Even the oil was cheap.
Castrol edge 5w30 was only £24 for 4 litres at Costco.
You need to check the inner brake pads on these though.
Outer ones may appear to have plenty of meat but inner ones often wear faster leading to premature disc damage.
Exhaust can corrode easily between back box and mid pipe, but a Scorpion cat back is only about £350.
Loads of other good info on what to check on here.
Good luck and welcome to the OC.