As a developer and technical co-founder myself, if you've been through 8 developers then there is definitely something you are doing wrong, either content wise or communication wise.

Here are things that make me take pause:

A) unspecified, or shifting, idea of how the app/website will actually work

B) bait-and-switching (it "sounds" like a pretty cut-and-dried good opportunity, but once you drill down into the actual task lists of what *really* needs to be done, it is not crystal clear and they only find that out after they look at your functional requirements/specifications documents)

C) you yourself may not have a crystal clear idea of what it is you are creating and thus have difficulty communicating it to someone else

D) your "end target" is shifting too quickly for a developer to get a "fix" or a "handle" on

E) you are reaching out to developers who "code to spec" and instead who you need are developers to help you understand the technical details of the "big picture" and who have the understanding of your business process & can help you make decisions

F) you personally may have a communication block with coder/programmer types, especially those who tend to be very "nit-picky" and who need to understand on a very granular level what it is you are attempting to accomplish.*

G) Too little pay/equity in your offering? Good technical co-founders already have a boatload of potential opportunities, so what sets yours apart?

H) Are you looking at the right places? I like http://women2.com/ and http://angel.co

* For example, do you have a list of all the different types of data on the site and their relationships to each other? Do you have a sketched out list of all the reporting or display screens you need? Do you know what your metric of success on the app/website will be?