While certainly not new, the trend of asking for work to be done on "spec" – i.e. as a sort of audition before landing an ongoing and/or permanent role with an organization – has seemed to be on a dramatic rise given the current economy. Although it's certainly easy to see why individuals would be interested in taking this route, especially if they're relatively new to the industry, these types of opportunities should generally be considered offers you can refuse.
There's nothing inherently wrong with wanting to prove your merit to a potential client or employer and there's certainly no mystery as to why they ask. The potential employer or client is essentially getting a portfolio of work for free. Although the potential employer or consultant may see benefit in going along with this arrangement, remember that for the other side there's nothing but upside, whereas for you, it's at best a mixed picture.
From hearing others' tales of these situations, the biggest issue lies in the fact that almost all the time, they get the job seeker or consultant nowhere. There's almost always some "hang up" that the other side has with the work: its quality, the way it was done, the time in which it was completed. In many cases, it could be something that could win industry acclaim, but still wouldn't be good enough for the prospect or potential employer.
At the end of the day, what the potential employee or consultant is left with is a time investment that was at best not productive. We tend to think of time as something that's valuable only to the very wealthy or important, but the truth of the matter is, time is a commodity that none of us can manufacture. Therefore, it has value and should be used wisely. Given that, the best course of action when you're embarking on a search for a job or a new client is to devise a plan that specifies what type of arrangement you're looking for, along with tactics that position you with a decent chance of getting it and stick to it.
Using this approach doesn't ensure success, but it does come with a much higher likelihood that your time will have been used for a worthy pursuit. Even if your ultimate goal isn't achieved right away, no matter how long it takes you can feel better that you maximized the time you had to pursue it. In contrast, if you'd continued with the speculative opportunity, there's a chance that you will come away empty and behind the "8 ball" in terms of time.
Lest you think I'm just preaching from the pulpit and not speaking of experience, like many PR pros, I went there too earlier in my career. And while few things in life can be spoken of with any degree of certainty, I feel certain in saying that should you try a similar situation, yours will end up like mine: with nothing to show for it.
While the economy's improving on many fronts, the job picture is estimated to be relatively weak for the next 24 months, given the sheer number of individuals that have to be absorbed back onto payrolls and the average number of jobs being gained in a given month. With that the case, these “speculative” offers are likely to come fast and furious for some time.