Arcade machines are big and bulky, and they only let you play one game per machine. Regardless of that fact, they’re still all sorts of awesome and most people would sell an arm and a leg to get the machine for their favorite game. That is, if they had the space for it after coughing up the dough for it.
An alternative? The R-Kaid-R portable arcade machine. While it’s not really lighter on the wallet, it’s definitely way more compact than a typical machine.