MIPS has been proven to have superior crash protection because the helmet rolls to absorb impact better, I don't know about TBI as much. I agree there are systems out there that have increased benefits over the standardized testing though.

The Lazer Z1 is a 269.99 helmet without MIPS or TBI. I'll say it looks beautiful on my head, moreso than the 69.99 Lazer Beam which offers the same protection. The Lazer Helium, offers MIPS at 229.99. So you're paying more for aerodynamics and material/weight savings. (Just using Lazer as an example because I'm familiar with their line up).

I guess it the price doesnt stop me from wanting one. : )