Looking for a user classified wordpress plugin - why no author develops a concurrant to awpcp where addons are too expensive?

wordpress

#1

Why no author develops a concurrant to awpcp where addons are too expensive?

I continued to search but I find no real alternative to this plugin!
Who can develop:

An ad plugin in wordpress
Resolutely geared user (by using user info, like avatar, profile, private messaging …)
Which uses WP users features for compatibility on any theme

A system like vivastreet !!!
with addons of course (but @ normal price)

Thank you