This copy of Hudson Game Music just sold for 49,500 yen. It does not include the obi.
According to old auction records, this album is rare as its perennially-expensive counterpart, Tecmo Game Music. Both albums have been sold ~20 times on YJA in the last 10 years.
Of these two albums, typically Hudson has been the less expensive of the two. But perhaps now it's catching up. A few months ago, another copy of Hudson sold for 25,000 yen, also without obi. Crazy prices all around for this thing.