I completely agree with your thought process 100%.I have been buying diecast cars since the early 90's.....never opened a package yet... the packaging is half the coolness of the car, and its worth more than a opened car.
I set free most my diecast cars from the packaging including Hot Wheels. It's just easier for me to display and store them that way. Out of the over 700 pieces in my collection maybe 40-50 are still in blisters. Quite a few are just doubles or triples of ones I already have opened and want to either customize or pass on to other collectors in case they need something. I also tend to buy a lot of loose cars from various thrift stores around town. I can totally understand how many collectors like to keep them in the blister cards though and see it as just another part of the hobby.Open the car and enjoy it.