I kinda feel like you are looking at maybe two options:
1. An experienced video person/team with a huge portfolio, but generally expensive and reliable
2. A hungry less experienced video person/team with a small portfolio, generally cheap and reliability unknown
I think the raw footage idea works for the second option but not the first option. The first option is likely fully scheduled, and takes on the work they want to do or projects that pay the best.
Option 1 will have stronger portfolios than the second option, and will reject the request to do an unpaid sample project.
I think you need to decide if you want to spend a little more for results that are nearly guaranteed (option 1), or maybe take a risk at a chance for a better value (option 2). I imagine you could try two different second option for the same price as a single video from the first option.
It is my
experience that one person is generally not exceptional at the three items that go into making a video:
a. recording footage - camera man
b. editor - editing the footage into a coherent story
c. audio - voice-over and music are an
art to themselves and really take a video to the next level
That is a bare bones team. Occasionally you will find a person that can do all three, but the skills required to be exceptional at each are quite different, often preventing all but a special few people from being exceptional at all three. I have run across a few people good at two of the three skills, but never all three so far.
Are there any colleges nearby or even high schools with a/v programs? You might find a teacher willing to force an entire
class of students to do videos for you to help build their portfolio. You may not be completely happy with the results, but the structure of needing to get the video done for a grade nearly guarantees a completed video out the other end. Most likely at least one student video will be awesome, most will be meh, and a few will entertain you with how bad they are
Unless you know someone, finding the teacher and coercing them may be more trouble than it is worth.
Consider the
local tv channel advertising departments. They often produce the best quality video for the cheapest cost. They would likely relish the chance to work on something different than tv commercials, with the added value of knowing how to convey a clear message in a direct/concise manner.