The fact of the matter is that we're selling ourselves to these rushees, trying to get the ones we want to join our house. And when rush is over, and they are convinced, unfortunately, some people don't keep up that same enthusiasm. Because then it's about respect and earning letters and being made to go through what everyone before you did and blah blah blah.
It's unfortunate that you feel this way, and I would suggest bringing the issue up to your member at large. And when rush is over next time, instead of treating pledges or new members like they are somehow lesser than us, we can treat them like we did at rush and be excited that they will be the future of our group. Pledging can often times breed contempt to brothers when pledges are made to feel less worthy than they were during rush.
But that's another story
Best of luck!