Dig Dug, Tempest, Star Wars, Galaga, Asteroids, Defender, Tron, Robotron 2084, Q*Bert, Bubble Bobble, and Centipede are up there among the top games ever. As far as the amount of coins eaten, nothing beats the good old side-scrolling space shooters.
I spent so much money on arcades a while ago, but I haven't seen one in so long. It seems the arcade universe is slowly collapsing. Quite a shame.
Also, Lemmings is my favorite video game of all time, but sadly it's arcade version only exists as a prototype.
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It's grime time.