- higher price = profit if they sell it, very low price= chance of buying at low price
- not much, they just take care of silver/gold low price, because if they wouldn't, silver price would be over 60$ and gold price would be over 5000$. And they don't want that.
http://komonews.com/sponsored/sell-gold/the-secret-world-of-bullion-banking-who-sets-gold-prices
And gold/silver is good to save as a reserve if there would be huge inflation over USD,EUR,CAD, CHF,....