I'm not sure -- this is inference, not informed comment -- but I think Tor's problem with the webscription bundle model is that they publish too much. Tor print about 330 books a year, so a webscription bundle for a month would potentially include up to 30 titles -- or it would have to be a limited subset. Either way, that introduces certain organizational problems (who goes into a five book bundle from the 30 books published per month? How do you handle accounting for author royalties?) and a bunch of other headaches. Much simpler just to stick to individual book sales and let the readers make up their own bundles. They can always add a discount coupon code later -- buy 5 books, get a 20% discount, or something similar.
I don't know for sure what pricing model they're going for, but my understanding is that what spiked their earlier ebook experiment was a senior executive's insistence that (a) DRM was mandatory, and (b) ebooks must not be sold for less than 80% of the dead tree book's price. This executive is now out of the picture, and I believe Tor's folks are smart enough to price their ebooks appropriately.
Not all Tor authors will be available through Baen's storefront, especially at first. Some folks still haven't got the DRM-is-bad message, others are encumbered by contractual arrangements involving other publishers, and so on. They'll start with a subset of their list, working with authors who're known to be "on message" and broadening out over time.
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