To me the 9mm is a compromise.

I love my bargain cheap like new glock and m&p 40cal pistols. Why not? They fire 40 just fine and the Federal and Blaser 180gr FMJ are wonderful choices for my rural area. If I decide the 40 isn't my game then it's no big deal to convert them to 9mm and I've done so with one glock.

Glock22
Glock23
Shield 40

These were very cheap and they function fine. What's not to like.