Unfortunately when it comes to selling cars, it's a buyer's market. I'm all for dealers servicing but i'm also mindful that a good mechanic (one that you know and let u see what they do) can do just a good job as the dealers if not better. I tend to buy my own parts and just pay for my mech's labour with all my previous cars.
For the lexus, i am planning to keep it for along while (6-7 years) an i agree when it comes to thinking of selling it could be fetching 20-30K (if i'm lucky). But then i know if i keep the car for that long, selling it won't be feasible due to the fact that i know the car inside out. A well kept car lasts ...
For what the dealers are charging i know if i buy my own part and go to my mech, i'll save around $300 (for the 36 months service).
For when it comes to the 100K service, i recon i will need to go to the dealer.