Keio completely exploded too.
Snatcher and PDS have pretty much always been $200+. Though both have went up a little I was thinking more about games I bought within the last few years.
Some examples: SFCD bought it late 2013 for $71 NM. Easily worth $100 now and has days where it's worth 120-140. Popful Mail bought early 2014 paid $100 and felt bad about it. Worth $150++ now. Sometimes
slightly more.
I actually did a fair bit of trading for the bigger US Saturn titles that I have. Happy to have knocked them all out though, that's for sure.
..........................:
http://www.ebay.com/itm/ALBERT-ODYSS...item234b8b8463
Edit: I can't read. So that Popful Mail link is actually way better than I thought since it came with a ram cart and the strategy guide. So it's not nearly as bad as when just the game went for $220.