Not to mention with the advent of digital distributors such as Steam, making an ancient game available for $2 still draws in a couple buyers every now and then without any marketing or much effort.

In fact, Commander Keen, a game that was released by iD Software 20 years ago, is available on steam right now for $5.

Naturally, there should be some drop off point in sales where the PR becomes more worthwhile than the couple bucks.