The difference is that a webstore is a site where you want to buy stuff, so you'd expect to see stuff you can buy, obviously.
For me, an e-reader is primarily that: a reader, not just another advertisment platform.
The e-reader manufacturers may have different thoughts about this, but if the ones that operate a store besides the reader are going to turn the devices into ad-posts, then I'll be getting a reader from someone else.
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