It's good that your app has some traction. I have a classifieds ad site too (targeting Canadian market). Initially I was wondering if I should use WordPress or created it using MVC I picked the MVC approach. The thing is when doing the MVC you have to implement most of the functionality yourself ...
Please clarify ;) the situation : - do you have a contract with developers ? - do you own the app ? or does it belong to the developers until you pay them ? - why are the developers asking payment ? - do you have a running app ? which needs does it covers ? - did you set a company ? - who are you...
I'm a positioning and messaging expert, working now and previously for several software companies in CMO type roles. Ideally you'll want to focus on your propositions to both sellers and buyers independently. You concept is dependant on providing the mechanism for bringing these markets togethe...