Just looking on ebay for vfour goodies and found a 93 rear wheel for $500 US plus $190 freight. I'm lucky enough to have gotten hold of one last year for a fraction of that. Are people that desperate to get hold of one that the prices are that crazy?
About a year ago one from a '92 with more than a few imperfections sold on ebay for $599. Then a month or so later one sold for under $100. For one in average condition it seems that about $350 +/- U.S. is a fairly common price. If you got one in good condition for a significantly less, count yourself lucky. VFR owners are just one demographic looking for them - customizers swapping to SS swingarms also covet them so that puts more competitors in to the mix.
To be honest, I think $350 is way more than I would pay. All of the ones I have bought for myself and/or acquired for others, have all been $300 or less shipped, with the exception of two different purchases. One, that went for ~$560 (shipped) but this was for both a front and rear wheel set with tires mounted on both wheels and another set I got was $180 shipped. This too was for a front and rear wheel set and the front was sold afterward for $90 so essentially this deal turned out to be a $90 total cost for the 8 spoke!
The deals are out there you just have to be ready to strike when the iron is hot and not pay more than you're happy about spending to get one.