Maybe I'm being naive here, but after market prices seem to work somewhat differently with minimates. As far as I can tell the older series tend to be among the cheapest on the secondary market, I credit this with a somewhat constant improvement in the figures. So I imagine a updated classic Gambit or Psylocke would greatly reduce the value of the originals regardless of slight tweaks or accessory changes. Having said that though I don't imagine this would be of concern to most as this is a constant occurrence in this line and I haven't heard of a great deal of market speculation in minimates. But of course this is all personal observation and supposition.