Well, first of all, is your driving mainly city, or highway?
Have you looked at the colour of the engine oil? (Is it dirty black, or still a honey colour?)
Are your trips short and infrequent, or long and frequent?
I'm on the highway all the time. Shortest trip for me would be 28 km's. Normal driving for me is 110km each way, 220km per day, to and from work, on the highway.
Even at 15,000km my oil is clean and in good condition. (I still have it changed every 15,000km)
if you are driving in the city allot, or do slot of short trips, then I would strongly suggest performing the 7,500km services.