Credit related adsense sites. Traffic from media buys?

I've been noticing a trend on sitepoint ..
I see credit related websites for sale with adsense incomes of more than $500 and the sellers claim that the traffic comes from media buys of around $50 to $100.

There is one currently running at sitepoint..if you check out the marketplace of established websites.

The sellers also claim that the content is unique..most likely using the uniqueifier plugin to fool the search engines..

I've tried doing some research but come up with nothing... I mean..media buys can't be for just 50 bucks...according to my understanding media buys run into the thousands..$$ you can just buy one or two slots.

Any ideas how these guys are doing it?..

 

It can be any price... depends on how you negotiate,
actual traffic and ad placement

 

ic...What sort of websites are we talking about?...as in...which websites offer media buys for prices that low?...

 

Any ideas anyone..?

 

any type of sites, any subject.

you need to dig deep for sites with good
traffic that can offer you ad placement
at low price.

do it on your own, you negotiate and
pay lesser.

if you go by 3rd party, the starting price
will hit into the thousands.