I believe they are relying on the consumer to be poorly educated in purchasing a car. The admin fees, are their way of compiling all of the charges into one to keep you from haggling for a better price... the dealership I went to which is not in the gta, had 0 admin fees, and rather had a breakdown of what you are paying for: wheel locks, $100 a/c tax ( my car has no a/c), window etching, tire stewardship, omvic fees etc.
That all being said every dealer is different. When I talked with direct nissan about the faulty ad they had posted on their own website, the sales manager was fully willing to break down their 599 admin fees so I could see what it consisted of. However I ended up putting in my deposit before the negotiations any further.
So no I did not pay any of the admin fees. The only downside I have had was that I had to wait a copious amount of time to get the car, and even then within a few weeks of delivery, I had to go in several times to resolve the issue of colour. ( when they originally started looking for me I gave them two colour choices, and when they placed the order they ordered both but insisted I asked for one of the two colours and that since it was there first I had to take the car.) I would have gotten them to remove or discount the security etching, I turned the monitor around when the sales manager was away for a few mins and it honestly costs the dealer 39.99 and you pay 399 for it.
Outcome overall was soured by waiting so long for the car ( 3 months ) and having to correct all their mistakes. I am pleased with the car, but would have been much happier if there were no issues with the dealer.
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View my fuel log 2015 Micra S manual: 6.5 L/100 km ... 43.7 mpg (Imp) ... 15.5 km/L ... 36.4 mpg (US) ...