Making a 'good' coffee...
There are a lot of factors that go into making "good" coffee. Keep in mind that "good" is a matter of personal preference. What is "good" for one person may not be for another. The beans, the roast, the grind, and the method of preparation all play a part in creating "good" coffee.
You will see that most of us prefer fresh roasted, whole bean coffee that is ground right before using it. ALso, the type of method used to prepare the coffee makes a difference in the end result. Lots of people buy the best of coffees and then ruin the coffee by brewing it wrong.
What do you consider as "standard coffee"? Are you referring to the canned ground coffee that you get in supermarkets?
There are a lot of factors that determine the price of coffee (region grown, importing issues, supply and demand, etc.) The most expensive coffee isn't necessarily the best.
There are many different ways of growing coffee beans, roasting, grinding and at the end to prepare your great cup of espresso. Quality starts with the quality of the beans, but must be guarded throughout the whole chain. Many companies blend different beans from different farms. Top labels often choose for single estate. This also gives assurance about the whereabouts of the coffee and whether the beans were grown in a social and environmental responsible manner. Roasting is important. But there are different preferences to what’s the perfect roasting. In e.g. Italy they in general prefer to roast a bit harder. The roasting also influences the taste. Grinding is very important too. The best coffee requires the best grind size to get the maximum out of it. But even if all this has been done properly, the final touch comes in making your fantastic cup of espresso. The right throughput time, pressure, and temperature are very important here. Even the best grown, best roasted, best grinded coffee can still turn into low quality disappointment in case this last part isn’t done well. Considering all, I think that the difference between low quality and bad quality boils down to getting the right bean, from the right farms and add passion and skill.