Jackpotting Japanese Vending Machines

High school dropouts, strung-out junkies, and fucked gaijin, behold:

This is all you need to jackpot vending machines in Japan.
I’ve seen evidence of it poured down coin slots of every make and model of jihanki, but passersby usually mistake it as simple vandalism rather than evidence of (usually attempted but not successful) theft. Hearsay in my college dorm was that older machines are more likely to produce coins (via return slot) than newer ones, and lengthy debates were held on the question of whether other brands of dishsoap would work as well as MamaLemon, pictured above.
Basically, the entire jackpotting phenomenon^* exists mainly because:
A. Japanese college students are unchallenged, lazy, immoral dumbfucks
B. The 500 yen (approx. $5) coin makes it worthwhile
^*Not to say this is as widespread in other areas, YMMV. Also, not everyone notices shit like this; I just have an eye for it.