On Paceadvantage.com there is a thread asking "What brought you to the game?"
Several of the responses are what sets us apart from other types of gambling. It takes no skill or thought to pull a lever or bet 7 on a wheel. This is echoed by some who say "I like puzzles" and "I like the mental challenge."
Horseplaying is a wonderful pursuit. If only we could get people to win a few more bucks and grind out a bit more play we might promote it to other gamblers who enjoy the same mental challenge.