16 drain plugs?... R U Serious?...

Here's why a Bugatti Veyron oil change costs $21,000
https://www.cnet.com/roadshow/news/bugatti-veyron-oil-change/

The Veyron uses a dry-sump oiling system with 16 different drain plugs, accessible after removing parts of the underbody. Refilling, along with checking air filters and all that good stuff, requires removing the car's rear fender liners and rear deck. Guess how many bolts are holding those pieces on? Too many, that's how many.  

Now, having to remove my gas tank to change the spark plug every 15-20k dosn't seem so bad after all.

Some BMW salesman told a buyer that, you should spend ten percent of the price of the car on service per annum. Do they check or replace the coolant and transmission oil at the same time as the oil change, and does this cost more?

Yep - the was the main reason I didn't buy a Veyron.