Perhaps this is somewhat off topic, but what do you actually use so many tablets for? I can definitely see the appeal of a tablet, but I can't really imagine a usage scenario that requires the specific features of one of four different tablets.
Many of them were free. The Galaxy Tab 10.1" is from Google I/O, the TouchPad is from HP for development, although I bought the iPad and Kindle Fire myself. I do use them for development too, where it is useful to have a device for the platform you are developing for.
Consider cross platform development, online services, or end user support.
Our customers expect streaming video to work regardless of what bizarro device their end user walked out of a store with after getting shaken down by a spectacularly uninformed clerk. :-)
