It's clear by now that ads are for lazy. If your plan is to monetize your site with ads, today just like 10 years ago, you lost.
Edit: surprised by the negativity on her reaction for _hacker_news. She's rebuffed by the $ and time investment for a single song ("unknown website, takes time to create an account, multiply by times she wants to buy a song). As she says:
> and not enough to pay to risk giving my credit card to an unknown third party.
This is a UX challenge, not some morale lecture.