Well ebooks prices are ridiculous in the first place. I only buy ebooks when the price is not fixed （bundles） and without drms. Other that that, there is so muc free stuff to download from the public domain, i dont get bored.
The DRM which genuinely vexes me is Audible, so I make a point of ripping (+++) anything I buy, because it actually makes the works difficult for me to play otherwise (it blocks output from the iPhone except in analog, so it doesn't play on my vehicle dock. I end up having to rip and put them on SD cards to play directly on the car's audio system.)
And i still buy physical books, too.