If you've got an addictive personality, you'd be paying for that regardless. MMO's for me have supplanted TV and movie watching, which is far more brain-disengaging (if you ask me).
As far as entertainment goes, they're pretty darn cheap.
CannedTurkey writes: For obvious reasons, scientists long have thought that salt water couldn't be burned. So when an Erie man announced he'd ignited salt water with the radio-frequency generator he'd invented, some thought it a was a hoax.