How much of the RAW tonal range is conserved when using "Merge to HDR Pro"?

Hello,
I am wondering how much tonal range is saved when making a HDR image with Photoshop? I have three photographs with an EV diference of 3. I can combine them into one HDR file just fine, but I can't turn one of them into an HDR file. This has made me wonder the following. If Photoshop is unable to turn one RAW image into a 32-bit image, then how much range is lost in the conversion process? If I try to open a RAW file in Photoshop for saving into a EXR. file for instance then I notice that Photoshop simply turns my image into an ordinary 8-bit per channel image.
I am using a camera with a very good CMOS sensor and the RAW data that my camera produces is of a very high tonal range. It would be a shame if Photoshop discards said range. This is a question that is very hard to Google since everyone that is using HDR is obsessed with tonemapping. I have to clarify that I don't care about tonemapping I just need the range. I would love to have an official Adobe employee answer some of my questions.
So these are my questions:
Why can't Photoshop turn a single RAW file into a 32-bit image by using HDR Pro?
Does the fact that Photoshop can't turn a single RAW into a 32-bit image mean that all the range is lost when merging many RAW files?
Does anyone know of a way to capture the full dynamic range of a single RAW image without using time consuming nonsense like virtual bracketing?
If there is a way. How would you combine many 32-bit images into a single 32-bit image in order to maximize range.
Why is no one else wondering about these things?

I am looking forward to an anwer concerning the HDR preview-result-difference as well... Since some posts suggest to check out the color profile of the input files, i did so: they are both sRGB. And the immense change of saturation and brightness (in other examples even worse than below)  couldn't be explained by a different profile anyway, IMHO.
working parameters:
Adobe Brigde CS6 (Tools/Photoshop/HDR PRO)
Adobe Photoshop CS6
sRGB both input and output...

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