None of the people I know ever had "school trips" in their primary education, and we've all turned out just fine, thanks.
Is this something new? Seems like a huge waste of money to me. Especially when you're wasting money on designer shoes "because she really wanted them."
Perhaps a better grasp of your priorities is needed.
Well, I have turned out just great I think....despite missing my 7th grade trip. I also turned out just great having gone on my 8th grade trip. And I turned out pretty good despite some pretty crappy things going on during my teen years. The point isn't if you will turn out just fine with or without. As a parent, I choose to do many things for my kids that don't as a specific item affect their "outcome". But I want their overall childhood to be full of activities and experiences that will enhance their lives.
I am 48 years old, so i hardly think school trips are a new thing.
But I do agree that $150 shoes are a waste. They will be forgotten long before the benefits of a new experience.