The site had a number of problems and lost a lot of traffic because of it. Seems like most of them got ironed out, but it took so long I bet a lot of people just went elsewhere.
That is a niche that might be hard to fill. Most of the machines that will run on 120 volt have been set to draw 15-20 amps max, so as to not trip standard breakers. Some of the older models could go pretty high on 120, but people would complain about tripping breakers, so the output on 120 got lower. Not sure if there is any easy way to raise that limit to give you more power on a 30 amp circuit. You might call tech support and see if they can set you up with something.
Long arc, short arc, heliarc and in-the-dark!