All strategies you can come up with will always have to be compared to the specific situation of each player. The strategy working for one does not mean it will work for another...

In addition, in the case of everyone choosing the same strategy none will work. If for example everyone would sell gold ore, no one would be able to buy it. The best way for the game to work is everybody picking the strategy he/she likes best.

For me personally, I am one of those guys buying the ore and turning it into coin...