Well, they apparently affect gameplay.
Munchkin Sparkly Good Fairy Shot Glass RuleI don't see how the shot glass is different from a promo card. Aren't there promo cards in the database too?
The Munchkin Sparkly Good Fairy Shot Glass may be used in any Munchkin game or its sequels.
When fighting a monster, either as the main fighter or as a helper, you may push the button on the Munchkin Sparkly Good Fairy Shot Glass to turn the pretty lights on and then drink one complete shot* to double the combat bonus of a single Potion. You may do this as many times as you like during a game, but only once per monster, and you must discard two cards for every Potion after the first per game. You must turn the lights back off after each use, and if you forget to turn them on before the shot is poured, the effect is wasted (but you still have to drink the shot).
The owner of the Shot Glass is the sole judge of what liquid(s) may be used.
I do agree that it clogs up the database. I wish there was a way that items could be added as sub-items that didn't come up in the general game results. Then you could sweep all the munchkin promo stuff under Munchkin. It would probably work for individual Magic cards and CCG's. Maybe you could set up "families" so that games with lots of expansions, promos, etc. would just show up as a single group entry in the results. Or the group would show up once in the results and there would be something where you could click to see matches within that family or something.