Yeah when they said its a $150.00 option I don't get it either...

All you're talking is a different nut and beefier strings???
I imagine (now that I've met Petr, the manager of the Czech shop) that it's because like the USA Workshop there is very little automation in that factory... and it's a "factory" if you consider there are only 35 people employed there.
It's basically a larger-scale version of the workshop in NY where the basses are made majority by hand. So the BEAD tuning requires additional time because that bass would have to be pulled from the standard assembly process, a customized nut would have to be hand-fitted and any adjustments to the truss rod and the string/setup would be different than the typical Euro4LX. So now one of those 35 employees is pulled off the normal build process to "custom-fit" a single instrument.
I'm willing to bet money that's why there's a surcharge for that setup.
I can tell you from first hand experience that Stuart and PJ discuss ways of keeping production costs down, not trying to find ways to add this or that to drive price up.
They are not like that, which is one of the biggest reasons I have so much respect for them. They're not your typical business guys looking to squeeze every penny out of their customers.
They know that times are tough and their guitars are not cheap so they look for ways to save money in their construction and not add it. So when you do see something that costs more there's usually a "human" reason for it and costs like those have to be addressed.
Another reason I love Spector guitars... they ARE still made by hand (the exception is the Korean Imports which are run off an assembly line like most guitar company's products). But the USA and Czech models are still mostly made by hand.
Lastly, I got to see the price list of a... similar shaped European builder at NAMM. And a "Custom Shop" bass, which is still mostly made using a CNC with little human sanding shaping and assembly, which produces a guitar along the lines of our Euro models with slightly nicer hardware... was nearly $10,000 US. It BLEW my mind. I looked at the bass in question and thought... perhaps a little nicer than Spector's Euro line... but for sure NOT on the same level as the USA models... and TWICE as expensive as the USA? Yeah... sign me up for any two NS-2s to one of those. LOL.