Meh, it's all hype. Don't get me wrong, they are perfectly decent razors...but the difference between shaving with a FB and a Slim is pretty negligible. I would have sold mine a long time ago if it wasn't my grandpa's.
It's not unlike a nice 7/8 W&B that says "for barber's use" will go for $100-$200...and a 13/16th celebrated that doesn't say FBU will go for $30. I doubt 1/16th and an etching magically catapults it to a superior shaver worth so much more. The funny thing to me is most of the people driving up the prices are probably on this board...you'd think after all these types of threads, they would know better.