Not worth it.
Dennis and Jim both agree strongly on that point. Jim includes the two pairs of terminals largely because it is expected these days and it helps his Speakers retain their value should an owner choose to part with them.
Sonically, passive Bi-Amping is largely inconsequential as each part of the XO still only uses what it needs to up until the point where the drivers can't use any more. So, for example, a stereo Amp with 250w per channel will still only deliver 250 w to ea XO circuit. The value is not additive.
That said, if the Big Woofer really needs that much juice, then it may be a worthwhile consideration... but in that event, I would reach out to Jim, first, and discuss with him.
By the way... Where' the photo!