While Amazon currently dominates the ebook market (in the US only), plenty of ebook aficionados don't have Kindles and don't want to read on their computers. And a number of ebook fans are avoiding Amazon for various business practices.
I don't buy DRM'd ebooks (I don't even download free DRM'd ebooks; it's not worth the hassle of dealing with all the extra steps to get the books on my reader), so if it's not available from a non-DRM'd site, I (1) won't read it and (2) won't recommend it to anyone else. (Doesn't mean I buy a whole lot of ebooks from other places; money's still tight. But I don't buy *any* from Amazon.)
Putting books on Scribd/Smashwords shows that you are paying attention to reader interests & concerns; it can win goodwill points from people who aren't direct customers, and for authors who are active online, that can be important.
For direct sales, it may not be "worth it" to post books in other places. However, if it's considered as part of a promotion/PR approach, it sends the message that you are interested in readers, not only interested in those readers willing & able to do business through a company trying very hard to arrange a monopoly on all book activity online.
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