For the most part, it's based entirely on how much I want to read the book. That being said, I save anything over about $10 for a 'special occasion' reward for self. I did the same with dead-tree books, so this isn't really a change in my own behaviour.
I do resent that I can't get boxed editions in ebook form for less than buying each separately, comparable to boxed editions of paperbacks. A prime example is The Wrinkle in Time quintet by Madeleine L'Engle. (Yes, I admit that I like books for younger age ranges too.) I have those in paperback, and would really like to have an ebook version too, as I prefer reading ebooks. The paperback quintet is 22.97. The ebooks available separately are 29.87. I wouldn't mind paying more for an omnibus with additional content. I won't pay more simply because they're not packaged together.
I've noticed that there are omnibus editions of some newer series, so this might simply be an issue of waiting for publishers to catch up.
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