I had the same thoughts. I would rather get a shop to custom make bumper like this, or even, I realized, have CBI make a custom one without the sides, and hopefully be cheaper.
I haven't found great need for corner protection in my offroading yet (I'm sure now that I say that I'll dent a corner soon tho).
My thinking is this: I like the looks of the stock corners better than any other aftermarket solutions I've seen (nothing looks good when paired with the '01 sport full sized fender flares I don't think), I have yet to dent a corner (*knocks on wood*), and, these corner pieces aren't that expensive if they do get dented, and easy to replace being that they are already separate from the rest of the bumper.
I did have one replaced once under insurance cuz some silly kid hit me at college while backing his subaru up, shop told me it was a real easy replace, parts and labor came to ~$300. I imagine it can be done for 1/2 that if I do it myself.