I subscribed to Autocar for a few years, mainly for consistency of supply and a little bit for cost.
The cost argument slipped away as they kept pushing up the price up. A newsagent in our village was always good at getting a wide range of monthly motoring mags but the weekly Autocar was a bit hit and miss sometimes. He now gets a regular and sufficient supply and he hasn't been without it for a long time. He will also hold some if I'm away for a couple of weeks. So, the consistency of supply argument is no longer the case. The price difference is about 50c an issue now, when I first started subscribing it was around €1. I'm happy to pay that to encourage a service like that in a small town newsagent.
As well as Autocar, I get Total BMW and BMW Car every month. I also get mags such as Evo, Car, Classic and Sportscar, Classic Car Monthly regularly but not religiously.