OP also missed on knowing why a late model BMW was for sale at a USED car dealer (and not a BMW dealership).Don't feel too bad. You missed one brake fluid, maybe a cabin air filter microfilter, and 3-4 oil changes. Self oil changes can be therapeutic.
The problem you might run into if you dont do the maintenance services at the dealer is, now YOU need to have impeccable records if you have a warranty issue and want to take the car to the dealer and have it covered.I've been studying, or more accurately looking for missing details on my 4yr/50K free maintenance package that came with my new F10. As near as I can figure, they pretty much change the oil. If I should actually accumulate near 50K miles, they may replace air filter elements around the car.
I'm thinking it is easier to stop by my BMW certified Dinan mechanic and pay him for the same services. It comes down to $100-250/year w/o the hassle of fighting commute traffic to the dealer. Or, the hassle of scheduling w/my closest dealer, and dealing with traffic & inconvenience.