This started out as a Valley Arts Guitars custom project (where it made sense, given the design Fender boutique they were) which - at the behest of Henry J - was later hijacked by the Gibson Custom Shop (within Gibson's then corporate structure in charge of the Valley Arts Guitars brand name). Sklar was horrified at how expensive the bass turned out, he wanted something good quality, yet affordable.
It's a fine instrument as deluxe Fender-knock-offs go, but not anything you couldn't just as well replace with a G&L model. The mandolin frets give it a slinky feel when playing, but I never heard a sound influence (Sklar believed to hear a "fretless effect", I have yet to discover that). Maybe decreased fret noise, which for a studio player like Sklar is undoubtedly a plus.
For ages, these things have sold for max 2.000 bucks (pretty much how they came out), is he asking for more or less? So rare and off-the-wall, I can't see it develop much value, especially with Sklar having practically disowned it.
