I think that for practical purposes he was very smart.
At some point, 'smart' people figure certain things out and actually make the system work for them. In other words, they are able to set aside the 'emotional' factor and keep things practical. He might not have concieved of the idea that armageddon would NOT come in his lifetime at the beginning of his career, but at some point he figured 'Yep, this here system is sticking around champ. better plan accordingly'.
one of the most charismatic and genuinely nice co's i ever met read the bible AND the stock market everyday. as a business man i could appreciate this. he had bought property, investments, and ran two business WHILE serving as a CO. My hats off to him, I thought.
The fact is, you can make it work in ANY situation, as long as you are smart and take the emotion out of the equation. (this is how you can in fact preach that one should not be greedy or put 'worldly' interests first, not get tangled in satan's system etc).