If you mean putting the works of the same author into one ebook file (an omnibus), the only time I'd do that is if it is part of the same series.
If you mean simply giving a discount on an author's works if you get them all (or at least the ones for the "bundle"), then that sounds cool. I've seen this done by basically having it to where you buy the bundle item in the store, and everything associated with the bundle shows up as bought for that customer to download.
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