Quoted from MrBally:
Start buying machines with credit cards from, oh, say, pinballsalesdotcom. Just pay the minimum for a couple months and utilize the purchase protection gimmick if defects show up. When the 2nd or 3rd machine is returned for a refund; in the words of Gene Cunningham: "action will be taken".
This is a great idea. 500 people bitching on a website or a letter from Visa legal staff questioning why they are refunding game purchases. I know which one will get results. I actually bought a Wonka using my cc. I should check their policy on this.