One issue I keep running into is the two items in the title not being in the SRD, and thus I can't drag them in from the compendium. I'm not sure why these aren't already purchasable, but if Roll20 could broker some agreement with WotC to sell the books, even piecemeal, it would save me a lot of work.
I think it comes to licensing issues. Fantasy Grounds has an agreement already (so a competitor) and dndbeyond.com is working on some virtual stuff and has the book content available digitally. They probably have propriatory agreements iwth them to not let competitors have (as much) access.