I don't think I'd ever be comfortable with a gamepass style service as the my main way to play games, you are always at the mercy of 3rd party deals as to when those games get taken away. I prefer to buy the games I like so I know I'll be able to play them as long as the hardware is available that supports them, I know there is nothing stopping you from buying the game after it's removed from the service but that just defeats the purpose to me. Of course that's the point of having the option to sub vs making it mandatory if you want to play a certain game, I have no doubt that people who don't buy a lot of games will look at these services and be very happy with them and that's great but they just aren't for me, especially when the number of games is inflated by so many 360 games.