The article might describe a number of different kinds of products people can buy with BitCoin and tell stories of individuals who used BitCoin for different purposes or invested in BitCoin and made a profit. Depending on how long our summary is supposed to be, we can represent those parts of the argument in more or less detail. If we need to summarize the article in a sentence, we might simply refer to all of this supporting evidence with a couple of words like "variety" and "profit."