Man.. all this noise about artwork you weren't legally allowed to duplicate and post for public use in the first place. Try not to forget that part. Localarcade is a cool resource, but you can't forget that it's existence is on shaky legal ground to start with.
Also, before going nutso about costs, make sure you understand the processes involved. Printing one overlay on an inkjet machine is a very different process both time and cost wise than screen printing and the resulting quality of product reflects it. End of the day, if you don't want people using the art, don't put it out there publicly. To me, if you make it freely available then so be it. If someone uses that art to make a high quality reproduction product that you can't do that's a good thing right? It's a part you wouldn't otherwise have no? If you think people get rich off arcade repro parts i'd think twice.
As a repro art producer I am both a user and a contributor to the localarcade repository. There has been an incident in the past where someone swiped artwork off my site that I did not want posted there and uploaded it there without my permission but this was custom artwork I designed and mahuti kindly removed it. I never thought of the AAL as being a me me me mine mine mine repository, it's there to share and hopefully assist others in getting artwork made.. if you have one overlay printed at kinkos they will be making money off of the work. I'd rather have someone that understands artwork and arcade games do a high quality product and then buy it from them and compensate them for their work. It's also great to have multiple sources for quality parts, too many inkjetters have come along and soiled the quality work done out there with prints made by people that don't understand color (Scott at Mamemarquees being a notable exception).
Anyway, i'd tone down the rhetoric about someone 'stealing' something that you stole first (unless of course you own the rights to the Atari artwork for Asteroids deluxe and didn't tell us )

Just because you redrew it, doesn't make the art legally yours and if atari wanted to they could prove the point.