The Economics of Chess conventions

[fabio guillermo rojas]

Observation: Competitive chess players often use clocks to ration time.
Seems logical - conserve your time for important or difficult move.
Straight forward budget constraint.

Question: Chess players often use the "touch rule" - you touch
a piece, you move it. Is there any economic motivation for this rule? 

Question: Any other games use economic insights to make playing
and spectating more fun?

-fabio