Rode one of the top of the range Trek OCLV frames when they first came out years ago was about 6k at the time I think (10 odd years ago),
They’ve been doing OCLV road frames since 1992. I had a 1994 OCLV 150 one, and it was utterly horrible, really really really harsh.
The first of the more crazy ones was the 5900 in 2000, which used OCLV 110, then they did a Madone SSL in 2005 which was OCLV 55, and one in 2006 which was OCLV Boron. Neither were that awesome though – the current generation ones were lighter, you paid a massive premium to have something very rare that saved a very small amount of weight.
Like I say though, I still really like my 2004 one, and despite there being significantly ‘sexier’ bikes around, I’d have a modern Madone without second thought.