Selling Linkshowoff.com ( online advertising site ) 2 years old / 3k registered users

I want to sell my online advertising site Linkshowoff.com , The script is unique and i hired a developer to develop this script . It is automatic and you don't have to approve the sites which are submitted to it . ( The script keeps a check on the widget which the users put on their site and then automatically approves it and displays it in the directory http://linkshowoff.com/directory/ , this process can take up to 7 days for a new site to appear in the directory ) The only work that the buyer of this site will have to do is to log in the admin panel once every month and click some buttons to generate a mass payment file and then upload it to paypal to make the payment to the publishers.
The site also have a referral system which helps it to grow on its own.
The site has more than 3k registered publishers http://linkshowoff.com/t1/2.JPG

Earnings
The total revenue of the site is $661 http://linkshowoff.com/t1/1.JPG since its launch . but i don't have any way to find the exact profit from the site . I charge $3 for every payment made to the publishers monthly, which means the earnings fall between
upper limit ~ $660 (case 1 : if all the publishers were able to earn just $3 each )
lower limit ~ $3 ( case 2 : if there was just a single publisher who earned the total $661 in a single month ).

Till now i have regularly paid my publishers and there are no pending payments ( earnings > $10 )

You might ask why the site has PR 0
This is one of the reasons why i want to sell it . The site is at PR 0 even though its 2 years old and have good number of quality back links http://www.google.com/search?q=link:linkshowoff.com. This is because Google's bot thinks that we sell text links , But thats not true , we sell nofollow links , which we have clearly mentioned on our site but the dumb google bot didnt pick that up. i have tried to contact google regarding this but didn't get any reply . ( cos they don't have time ).

Traffic stats
i cant install analytics on the site because to do so i have to put their code on each and every page and that will be cumbersome , but you can get an idea of traffic from this awstats screen shot http://linkshowoff.com/t1/stats.jpg , you can also refer alexa if u want.
I guess the site gets around 100~200 or so visits per day.

i am looking for offers > $1000 for this site