I think most people here have pretty good advices and understand the general idea.

First, let me add something not discussed. You can also make money on a collapsing market. It doesn't need to go up to make money. Google "Short Stocks". Traders make money all the time on plunging stocks and markets. Every day.

Second, why wouldn't you want to invest in oil?! Some really good companies are at their 5 year lows including oil itself. Why wouldn't you buy at rock bottom prices? Because the world is coming to an end and oil will never be used ever again?

At the time of this post, I have not seen or heard of new technology that will take over the oil kingdom. Oil is not dead, it is beaten to the ground, and it may head to low 50s or 40s. That's fine. When you invest in oil, you want to get on the low cycle. Make $100k from $10k in 5 years.