No, DRM does not 'keep' prices low, because there is a development cost to DRM and that gets factored into the book cost and passed onto the customer.
If I had to make a list of what is 'holding back' ebooks, I'd say it would be:
Price, DRM, Book Availability (for the Americans)
and
Geographical Restrictions, DRM, Price, Book Availability (for the non-Americans)
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