As for DRM, if you think that at least 200,000 people haven't heard of DRM (all my statement requires, if you'll read closely) ok then.
Do your own research, if you want to. There are resources available. The EFF alone has around 80,000 members, I believe, and I am sure just about every one of them knows what DRM is.
The problem with measuring opportunity cost is that it is very, very, very hard to measure. DRM means that I haven't bought about $500 worth of books or so, so far, I'd guess.
Wonder how many people there are like me? More than a few, even without having hard numbers, I'd wager.