Pinballz is not a reseller per se. They are a 'barcade' and the business model of placing these new pins on the floor and pricing them high allows people to play these games until some 'unsophisticated buyer' actually pays the higher than market price. Without this, we would not have such high quality pins to play. Buyer beware certainly applies here, but if there are buyers willing to pay him for these games, what is wrong with that? He is in the business to make money and has found a profitable model. A pure barcade or pure reseller model has such narrow margins that most of these businesses either have to scale greatly to survive/thrive or die a slow death.
I'm just saying, don't troll the poor guy for making a buck - AND he is helping to bring back public awareness of pinball. It is businesses like Pinballz that will help keep pinball from fading into obscurity. Private collectors will not keep pinball alive past 1 or 2 generations.