What you can find a game in the wild for is different than what its worth. Most people don't realize that some games have changed so much in a short time. If you ask a fellow collector, how much for your paperboy, they might think its worth about $1k, when today its 2x or maybe 3x that.
The big difference is all these collectors trying to do barcades. adding a food fight, mad planets, paperboy, tapper, tron, burgertime, 720, ect is having an effect on game prices.
Movies like pixels, wreck in ralph, ect just reminds people about the classics. All it takes is a little push. If stuff like warcraft and assasins creed make money, You might soon see asteroids, centipede, missile command, mortal kombat, rampage, spyhunter, tekken, and tetris in the theaters.