Of course. However, in the light of all the recent cost-cutting, it would be "nice" (rather than strictly commercially sound) to allow a trade-off along the lines of:
- 24 cars offered, 3 used.
- Cost to EK per car, say, $20.
- So, saving of $420.
- 42,000 miles credit (42K miles actual cost to EK ... ? $42 perhaps?)
- Profit
Think you will find Chauffeur Drivers are contracted by a contractor who Emirates Contracts on a fixed fee per car movement in the range of $100 per movement. Savings to EK is around $100 they don't have to pay a contracting company, however it will no doubt differ port to port - as it wouldn't surprise me in places like Singapore, the amount to be as low as $20
Miles would be in cost terms $20-$40 per 1,000 to EK, not $1 per 1,000
But all is missing the main point of what any service attached to a "Full Service" carrier is - that it is an all inclusive single fare that includes all the services - and you are not having to pay $5 for a can of coke, or 30 cents for a square of toilet paper.
The second you encourage a Full Service carrier to give discounts or credits for not using a service, is a slippery slope encouraging them towards being a low cost carrier.
It is the one thing that turned me off Air NZ when the put 4 fares on the Tasman, so you get savings by not having checked baggage or meals, not that I have an issue with it in principle - what I found was that simply asking for something I had paid for - the answer was never yes Sir, it was - let me check my paperlist if you are entitled to that service......
You are really thinking about your short term savings, rather than the long term ramifications to yourself.
Chauffeur drive is there as a service option for you, just like extra checked baggage, just like lounge access, just like priority baggage tagging - Full Service Airline - all inclusive, use it if you wish. Likewise the airline will do the odds on someone using the service - and adjust their fares on all taking the odds into account along with all other market forces to consider price.