Except your games would never fetch those kinds of prices because you don't have connections to auction houses and grading firms like WATA Games to bullshit inflate the value at auction of your game far beyond what they're actually worth.
I think emulation and preservation of games online have kept the value of original carts from becomes too crazy for the most part. Outside of hardcore collectors, which there are very few, people aren't going to drop loads of cash to collect games. And even the rarest treasures tend to top out around $100-200 in most cases. There are a couple of notable exceptions but for the most part if you really wanted to do it you could probably collect almost every N64 cart for a couple thousand.
I think what holds games back from truly gaining stupid collector's value is that the devices and the tech to run these games is a decayed resource. Unlike a Pokemon Card which will never decay in terms of the ability for the card to be used in the game in which it is associated, video games will fizzle out.
Find a working 8-track machine. A working Atari 2600. A working Commadore 64. These devices are going to become rarer and rarer over time.
Meaning that the only remaining way to preserve the game itself is to make a digital copy of it via a Rom. Some companies are willing to update these roms to run on current platforms and resell the ROMs for profit, like what Nintendo is doing. While others simply move on for the most part and you can only find the games via emulation online.