"Well, we asked people five or six years ago, how's the right way to make some money. They told us to charge people who were already paying too much money for less effective ads.
We do very little of that, just charging for help wanted ads in three cities, and for apartment rental listings in NYC from apartment brokers. (They asked us to charge them, to reduce redundancy and to improve quality, and that's working.)
We rejected banner ads starting in late '97.
We direct donations to our foundation or other nonprofits."
REF:
https://answers.yahoo.com/question/index?qid=20060720194938AADFTbO