Embellishment is an irresistible and consuming impulse, going back to the beginnings of human history. ... Probably the strongest motivating force is the simplest: the inability of almost everyone to ever leave well enough alone.
An irresistable footnote: in 1971, pension fund managers invested a record 122% of net funds available in equities - at full prices they couldn't buy enough of them. In 1974, after the bottom had fallen out, they committed a then record low of 21% to stocks.