I realize the network effect is positive for you, but I think it's negative for the world at large. One would hope that hires would be merit based, not simply that your are friends in the MBA club.
It doesn't have to be binary there. It can be merit-based and heavily dependent on having friends in the club. And that's not a special property of the MBA folks. That is to say, you might be good enough to be a lead engineer at Google, and they're not going to give you that job if you aren't, but it's still a whole lot easier to put yourself into the position of being able to do that if people in your network work at Google. MBAs are no different. You don't get to be a VP of finance because you used to do bong hits with the CEO, but if you're someone who is able to do the job of VP of finance (and can convince people of that), then that connection to the CEO is hugely valuable.
Networks aren't just for MBAs. I'm a software engineer, and I got my current job partially because one of my best friends works here and he gave me a referral. Now, I'm sure I passed the interview on my own merits, but I might not have even gotten to an interview if not for my friend letting me put his name on my job application.