You are paying too much money for Service A... which is basically oil change and lots of inspection. Service B has air filter and some more inspection.
Instead of forking over $500 for each service... this is what I would do... since it seems like you are not mechanically inclined.
Every year, change oil... synthetic oil... I think dealer charge around $110 to do this job... I am not sure how much at quick lube places... probably $40 less. The critical point of this oil change is the filter... I think quick lube tends to use cheaper paper filter... this is not what we want... we want the fiberglass filter which cost $18 each... so in your case, dealer is best bet. Just insist on oil change.
Maybe every 3 years you let them do a service B... which covers everything on Service A.
If you are mechanically inclined, you could do the whole oil change job yourself for around $45 or less if you buy synthetic oil on sale. I use oil suction method, so I don't get under the car anymore to drain oil. You can buy a cheap oil suction tool... for around $40 or so... takes a while to suck up the oil.
I personally am using Harbor Freights air suction tank... which is around $120... uses compressor to create vacuum and comes with alot of attachements.