I dunno, while the parts for a tablet are less than $500, R&D, marketing etc eat up a lot of profits, plus Apple sells it's stuff directly, retailers get a razor thin profit margin on Apple stuff, essentially so they can increase foot traffic and sell accessories with high profit margins.
Manufacturers are going to have problems with dropping prices on their offerings, and maintaining any kind of profit margin on the Android tablets. For instance, the nook colors on eBay are being sold for less than it costs to manufacture them, while B&N hopes to make some $ on ebook sales to make up the difference.
Moto is going to screw up it's margins by offering the "free" upgrade to 4G, plus it's not going to be making the kickback profits from the carriers as many are cancelling their data plans ASAP. Plus Moto is going to have to work on updates to it's notoriously forever in Beta OS by Google, Honeycomb likely won't be very stable for months, if I were to guess, they'll need at least 2 revisions, likely 3 to get a decent experience...
The last time RIM released a product that was an Apple product killer was the gen 1 Storm, and we all remember how that turned out... Hopefully they learned from the Storm fiasco.