I'm a collector, but I don't understand why people would even want Stadium Events in the first place beyond its insane monetary value.
To me, I find it completely worthless to collect junk games. Stadium Events is a perfect example of this - it's just World Class Track Meet by a different name, which is itself a mediocre game you might play once or twice. It's not even worth owning let alone playing.
The crazy prices of Stadium Events represent only the game's rarity - not it's greatness, not it's fun factor, nothing at all but the fact that it's a variant of a common game that's not very good to begin with.
This is why I don't understand the collector who aims to own every game in a console's library, especially the NES. The bigger the library, the more absolute crap there will be in the library. I'm aiming for a complete NES collection, but my aim is to own every good NES game, not every NES game period.