How much Bitcoin volume is for purchasing stuff versus trading/speculation/investment? What percentage of Bitcoin transaction volume is due to people actually buying stuff ("goods") versus between traders, investors and speculators?

Of the "goods" volume, what percentage is for illicit purposes (drugs, etc.)?

Are these percentages relevant to the future success of Bitcoin?
It's been estimated (with many assumptions) to be somewhere around 1-4% of the total trade volume. This seems bad until you learn that the speculation market for USD is $5 trillion a day.