Nice bass. Looks familiar!
I was looking for an old S500 for months and not finding one, so I put that L1K up as trade bait and had an offer within hours. Sad to say, I don't like the S500 near as much as that bass, but I'm a lousy guitar player.
As far as an investment, it will be interesting to see what happens. I suspect the low demand is because not enough stars everyone wants to imitate are using or used one.
I personally think they are undervalued. It took me close to 6 months to find the exact L2000E I was looking for. L1000's aren't as rare, but they're not exactly common either. I certainly won't be planning my retirement on em, but I would be surprised if the early ones don't see a good bump in price within the next 10 years.