You have to decide if it is worth it to YOU. If you have a bike with 100,000km on it but you are planning on keeping it for another 100,000km, then you have to decide if you want to look at the worn out paint for that long. If you've had the bike since new or nearly new, you know how it's been ridden and how it's been maintained. A well maintained and non-abused VFR will easily do 200,000km so IMO it is not worth it to swap that known history and reliability for another VFR with unknown lineage just to cut down the mileage. Besides, having a bike with 100,000+km is a great conversation starter! When the guy you're talking to freaks out that it has that much mileage, you just play it cool and say it's barely broken in! If you like the bike, want to keep the bike, and it doesn't need other repairs more urgently, it might not be a bad investment.
I know with one of my previous bikes, a Yamaha Virago 1100, when it had 96,000km on it the paint and chrome were still excellent. People couldn't get over how nice it was given the mileage. A freshly painted VFR with 100,000km on it would certainly wow some people too.