If such servers ran the Nasdaq stock market, for instance, they could instantly detect a sharp upsurge in stock trading, then adjust quickly to the higher demand.
For instance, an entertainment company has offered capacity on 4, 000 servers that would otherwise sit unused (probably in a lull between making animated movies).
Wave Gliders collect enormous amounts of data and crunch the numbers distilling 4 gigabytes of raw data to a kilobyte of relevant information a client wants, for instance and then activate their Iridium satellite link to beam the result to servers on land.