I propose to pay for the development of the Survey resource which would then be available to purchase from the Xenforo Resources area. I propose the developer and I split the revenue for as long as the developer commits to maintaining the resource in his/her own time. If the developer is unable to provide support then I will retain the full revenue in order to be able to work out an arrangement with an alternative developer going forward.
Rather than provide a detailed specification document, if I say that we want to replicate the functionality of http://www.surveymonkey.com minus the redundant design elements (like uploading a logo etc.), is that sufficient for coders to be able to provide a quote for the work?