if it had the Bisonic pickups it would be worth maybe that price. those humbuckers are not well regarded.
I agree that the Hagstrom pickups are more sought after, and thus more valuable, probably because they are older than the humbuckers, and because of the hype and excitement generated by the emergence of the Hammon Dark Star copies (which I have never heard), of those originals. But two things I can say are true on this.
First is that Guild considered the humbuckers to be enough of an upgrade that they produced ads touting just that, as seen here. They were even sold separately as replacement 'upgrade' pickups for use in other basses. Guild definitely considered this change to be an improvement, over the previous pickups.
Second, is that at least IME, having played Guild basses with both types of pickups, that they sound different, but neither one is vastly better sounding than the other. It is probably just a matter of the originals being single coil and the second generation being humbuckers. Played through an all tube head (either an SVT or a Fender Studio Bass) I prefer the thickness and slight 'wooly' tone from the humbuckers, over the bi-sonic Hagstroms. So, if there are folks out there who don't regard the humbuckers well, that is their opinion, but not one that I share. Also, the Guild bass humbuckers are much more clear in terms of mids and treble than the Gibson humbucker (mudbucker) that they sort-of resemble. The Guilds are much more full-range, and when soloing just the bridge humbucker can actually be rather trebly and thin sounding with the tone control fully open.
And if that's not enough, realize that one of the rockingest records ever ever ever, The Stooges "Raw Power" was recorded with a Ron Asheton playing a short-scaled JS Bass II with Humbuckers, as can be seen here in photos from that era of the Stooges. If this record are not part of your experience, check it out. The band rocks and the bass sounds great.
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Iggy & The Stooges - Shake Appeal (2010 Mix) (HQ) - YouTube
Iggy Pop &The Stooges- Gimme Danger HQ - YouTube