JPG file size differences in ACR and PS

Camera: Nikon D80
Photoshop: CS3 Extended v.10.0.1
ACR: version 4.3.1
Saving from ACR, Q=9 -> 1,2Mb
Saving from ACR, Q=10 -> 1,8Mb
PS, Q=11 (no thumbnail) -> 3,1Mb
PS, Q=11 (with thumbnail) -> 3,1Mb (no difference)
PS, Q=12 (no thumbnail) -> 5,8Mb
PS, Q=12 (with thumbnail -> 5,8Mb (no difference)
Save for Web, Q=90: 3,7Mb (larger than PS/11)
Save for Web, Q=100: 5,8Mb (same as PS/12)
1.) Why ACR saves much smaller files?
2.) Why there isn't difference when saving with thumbnail or not?
3.) Why the different methods?
4.) Is any of them better? If yes: why the other? If not: why does it exist?
Saving from ACR produces much smaller files than any other known RAW converter. I've tried Bibble, Lightroom, CaptureNX, DxO and all of them created nearly the same size as Photoshop does. So the most important question: why ACR creates so small JPG files?
Thanks in advance!

Huhh,
the question isn't stupid, just seems a little bit strange in my point of view. But you're right, i must confess. So halfway i am the stupid, not the question (and not the software).
But when i choose 'maximum' in ACR it gives me the 10, and i thought maximum is the maximum. For me it tells about the highest possible quality. There is no value bigger than the maximum.
I've never realize that in PS the way is exactly the same like in ACR! In PS the maximum is 10 too!! I'm always enter the value by the keyboard and never choose a preset. And in PS there's a slider showing the full scale and the entered value, so on that i can see that there's life after the maximum. in ACR the missing slider suggested me that 10 is the top level. But now i've entered 11 and 12 and gave the same sizes as i gave from PS with 11 and 12.
So i can conclude that the GUI of ACR isn't perfect (OK, i *must* now it uses the same engine/values like PS), but the method behind the scenes is perfect, like in PS. Sorry for the trouble and thanks for the very fast answer!

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