Will botnets compete with Amazon S3?

Reading about the Storm Worm's botnet being bigger than supercomputers I was reminded of a prediction I've been making for a while. Spamming and phishing and other bad behaviour relies on overwhelming miniscule conversion rates through huge volume, so it has to free-ride on others' resources to actually make money. However, large distributed computing is being commoditised, by Amazon's S3 and E3C and others. At some point the botnets will realise that they can make more money by competing with Amazon or Akamai to store data in their stochastic cloud of compromised computers. A variant of memcached with a redundant hashing algorithm, or maybe an adaptation of Freenet would be obvious places to start; for all I know this already exists.