The Devil You KnowVersus The Devil You Don't
This actually ties into a previous post on maintenance. Part of the issue here in vendor lock-in (the devil you know), which was the mantra of the hybrid cloud builders, but the market has shown otherwise. As IT is in essence a maintenance issue, dealing with the somewhat more clear certainties of the 'public cloud' (a bit of a misnomer, no?) is preferable to the somewhat more uncertain world of hybrid--aka Cloud-as-a-Service.
What's interesting here is this doesn't show that AWS is ranked higher than IBM's hybrid offerings, but rather that reading between the lines, it is that owning your own cloud is not a good investment. The technical reasons for this are far beyond my scope, however, the smart money seems to indicate that owning your maintenance is not the wise choice.
Via +Paulo Silveira