There can really be no doubt that candy machine vendors would stand to further their income through the fruitful and generous act of simply allowing my crumpled dollar bill to actually pass through their unjustly condemnatory money receptacle so that I may obtain my Snickers bar. Should they indeed choose to relax their unjust, callous, and highly discriminatroy standards governing the selection of which tenders are allowed into their machines and those which are not then they may indeed open themselves up to the occasional conterfeiter. This I grant. However, these occurances would occur with far less frequency then does that of the average Joe who is just trying to put money into the machine but cannot.
In allowing these ghastly practices to perpetuate they have introduced a schism between the American people and successful commerce, and some might argue, reason.
I used to test those things when I worked for the gaming control board. lot of tech goes in them, they are actual mini-counterfeit detectors. can't get accurate readings off that cotton/linen fiber paper if it's in bad shape, etc.
William F. Buckley describes a conservative as, "someone who stands athwart history, yelling Stop." - and then proceeds to drag civilization back to times best left in history's dungheap.