After some eBay research, I really think some of the rarities for some Lynx games should be adjusted... most notably:
Battlewheels: While this game was rare at a time, it's no longer hard to find, and eBay commonly has about 6 or 7 available at any time. When I first started looking for it, it was going for >$20 each time, now I see auctions starting at $13.50 end with no bids. It's definitely not as rare as Battlezone 2000 (Which I noticed mostly because they are right next to each other on the site). I think Battlewheels should be dropped to a 4.
Lynx Casino: I don't hear much about this game, and I only casually look for it... however, I've seen it VERY few times, and I think it's rarity is higher than the 5 it's currently rated. I'd suggest raising it to a 6.
Rampage: This one also doesn't seem like a solid 5... I'd call it a 4.
Joust: I'm a little torn on this game... it's around the same rarity of Battlezone 2000, but it never seems to draw as many bids... However, it's definitely more rare than Battlewheels, so I think it should be a 5.
Super Asteroids/Missile Command: Same story as Joust... although I think it might be slightly more rare than Joust even. Gordo 106 might fall into this category too, although I have to admit that I haven't been looking for it very hard.
Xenophobe: I *really* think this is more rare than a 3... maybe even a 5.
Other than that, everything else seems quite sane to me However, I should point out (although you may already know this by now) that a number of the games you have marked as prototypes are actually available from Best Electronics. Most notably, Marlboro Go, and Road Riot can be had for a price. Some 2600 games that have been released prototypes (Like Secret Agent and Bugs Bunny) have dual entries, which might be applicable here.
Of course, these are just my humble suggestions
--Zero













