Yes, you did. Why do some people need what they said repeated back so much?
This shows you have no idea how speculation works, only a simplistic phrase about 'supply and demand' that makes it impossible to make net money on speculation.
According to you, if they 'make a lot of money bidding up gas prices beyond supply and demand', then that money will have to be lost when 'supply and demand' forces the prices down. Legendkiller explained to you how speculators actually do make profits they keep, large ones, driving the price up above 'supply and demand'. Simple logic says the massive sums made this way are parasitical extractions of wealth from the people paying the inflated prices.
Again, do you even know speculation can be done through long or short position, which can bid up/down price? So what makes you so certain that derivative market only have one way impact on oil price? traders can make money buying or selling derivatives, why are they just bidding up the price not down? You ever think of that?
Sure derivative market is just like any other markets, industries, there are lots of money to be made for those who knows how to play it right. Yes the market is not 100% efficient. Yes if you have big enough capital you may be able to manipulate the market. But given derivative market is world wide, it will be tough to do.
Bottom line, derivative market has benefits and currently the benefit outweighs any cost due to market inefficiency. And as for Koch brothers, again, you have absolutely no proof of the amount they invested in speculative market, the instrument they invested in and if those instrument has positive, negative, long term, short term or neutral impact on oil price.
All you have is unsubstantiated attack because those guys hold a different view from you liberals.