You're probably not supposed to think about it that much. Your reaction is supposed to be, "Oh, ha ha, just like how there's vending machines all over Tokyo!" Then you move on and laugh at the joke about Eiji's underwear. If you start thinking about the plausibility issues with... almost everything in OOO, the show will just never have a chance to entertain you.
something I've been wondering that someone brought up in the candroid thread
Why are there vendors all around the city? Sure someone could say, well OOO need quick access, but why not just give him a single bike to ride and have to insert a coin every time to start it.
I felt so bad for Gameru when Uva destroyed his fort, I wanted to give the poor Greeed a hug :disappoin
I really love Gameru though. He's just all round adorable and kinda sad at the same time, all while being showcased as quite the physical powerhouse, so I'm looking forward to seeing him get the spotlight come next episode :buttrock:
After rewatching episode 6 I noticed that Gotou simply used a remote to activate one of the vending machine bikes. Could this mean that the Kougami Foundation actually don't need to put medals in, and that they're just manipulating Ankh and Eiji to use up theirs instead?