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I wouldn't worry too much about getting that amount of traffic at the beginning of your new endeavors unless you're spending a ton of $$ on advertising as you're in a compeitive space that will take time for your sites to rank high for money terms.
Yes direct advertising, affiliate links, banner ads etc. should make you some decent money once you have the traffic along with adsense, YPN etc.
If you have an overture or adsense account you can quickly get an idea of what people are paying to advertise for those keywords that the site ranks for. Look at the logs, find the keywords, put them into the bidmanagers and then do some simple math on what the visitors are worth.
If you picked the worst possible affiliate sites in real estate you will make at least $30k per month.
If you picked the best possible real estate partners you will make about $80K per month.
If you picked Google Adwords for this program, or something similar, you will make about $4k per month.
I do exactly what you are attempting to do. Merchant partners pay, Ads also pay, but less, so if you miss the primary goal, get the secondary!
We are making around 5M hits, 50,000 uniques 900k pageviews and are making aprox 300$ a month with adsense.
It totaly depends on your niche and content you are offering!
We are going to sell advertising directly with our new version but my highest hopes are 2k a month (at the moment)
So donīt trust the numbers some members are throwing in.
If your friend already has 7,000 paying members, she can upsell them lots of stuff. Webmaster World makes it pretty hard to help people out on specifics because of the rules, so you'll have to do your own research into this stuff. Check out the major affiliate programs and Adsense. Do as much testing as possible and it should add a nice amount to your friend's bottom line.
thanks for the response. my feeling was that with the high paying membership, she would want ads/banners/affiliates that were synergistic and relevant to her audience. yes, mortgage ads might pay a higher ppc, but is that really what someone concerned with adoption/child rearing/siblings really wants to see on a regular basis when they visit the site.