What you've got to realise is that the reason most people start reading derivatives (or start trading anything for that matter) is to make a quick buck --- and the best way to make a quick buck is to punt on short term movements in price. --- thses individuals don't have the patience to trade over a time horizon of any reasonable length.
Thus, the whole derivatives market is inhabited by short term trades, and consequently all publications are based on the short term trading philosophy --- be it trading wheat, oil, silver, 90 bank bills, stocks, .. or anyhting else for that matter.
