The most common cause of low prices is pessimism - some times pervasive, some times specific to a company or industry. We want to do business in such an environment, not because we like pessimism but because we like the prices it produces. It's optimism that is the enemy of the rational buyer.
For he who innovates will have for his enemies all those who are well off under the existing order of things, and only lukewarm supporters in those who might be better off under the new.
Every fanatic or enemy of virtue is not at liberty to misrepresent the greatest geniuses and most heroic defenders of all that is valuable in this mortal world.