Helping You vendors And Affiliates Make Sales

Hi,

I am sick and tired of the thought that I will have to go from site to site to advertise my referral/affiliate links.
I am now thinking of launching my own classifieds.
But, I don't want it to be just another Classified like the rest that hardly get any traffic. And so, what categories do you suggest that I create that will attract:

* vendors (sellers)
* affiliates (sellers)
* buyers

I mean, what categories and features would enable you, as an affiliate, to make easy sales ?
And, what categories and features would enable you, as a buyer to prowl in it like regular visitors prowl on ebay, backpage, craigslist and gumtree ?
I mean, apart from ebay, the others look rubbish but for some reason they get constant supply of posters, advertisers, readers and buyers.

What features other Classifieds lack that you think would have made you more sales ?
Currently, thinking of running a free Classifieds to attract lots of posters.
Want to run something that would make you people make easy sales and make you stay there for hours upon hours.
So, what's gonna make you glue to it ?

Thanks