The video below pretty much says it all: while the value of public clouds - most often as a part of the growing 'hybrid IT' model - is indisputable for the majority of IT organizations, there are some vendors that have seen the opportunity to capitalize at users' expense. Those wanting to make a quick buck are likely driven by a desire to make the cloud look artificially more expensive than it is, as much as a desire to protect revenues....but either way it is insidious. It is insidious for two reasons: obviously it is just wrong, but also it is another example (like the bad kid that gets the whole class detention!) of the minority spoiling things for the majority.
Anyhow, take a look at the video first, and then take a look at your invoices too....just to be cautious and sensible.