Well here's why.
I was looking at getting a new urban assault mtb frame. I have new race face cranks with the external bearings and they are crazy badass, but I was looking at getting the on one gimp frame because it's steel, but it has the american style bmx bottom bracket and since I want to continue to use my new cranks I was considering just using those cups but if they really sucked I was just going to avoid it all together and look at another frame.
Oh, I know the euro bearings suck, I went through two bottom brackets in a month before I bought these new cranks.