I've bought one paper book since my first Kindle. My own experience with people who own digital readers is they say things like "Oh Borders! Wow, I just realized I haven't even walked into one for about 4 months now."
Agency ebook: $6.99 NO DISCOUNTING WHATSOEVER ALLOWED
Paperback (new): $6.99 -- fully eligible for Borders coupon discount
You do the math ...
My Math is to not buy the book at all if I think the eBook is wrongly priced. If I'm going to read it in paper, I'll just borrow the library copy.