ICE was able to buy the Big Board because commodities and futures markets now offer more action, more trading volume and more transaction processing capability than traditional stocks. Stocks like Twitter get the headlines, but it is futures markets that have the volume. An exchange, in the end, is just like any other transaction processing business. The quality of the computer services it provides determines its financial fate, and the volume of the transactions it processes define its finances. Follow @DanaBlankenhor This article was written by an independent contributor, separate from TheStreet's regular news coverage.