How long does your files have to be to qualify for something like this? I have certainly never written anything a long as a book, but I suppose I could write something short, like a tutorial, or a something based on my personal experience.
That kind of payout is definitely enticing as I certainly have to do a fair amount of work at what I currently am doing to earn $1. I'd just want to be sure I wasn't wasting my time trying to earn when I don't have the skills needed and am only going to get denied.
Sharecash, of all companies, don't care much for what their users post. Though they may have rules, I've found that they have next to no quality control in practise. YouTube (at least way back) used to have Sharecash links all over the place. You'd find them everywhere if you searched for anything related to money or beer money, practically. Usually you'd get a text file that contained a few text lines and a link at best, other times you would get a file with gibberish. Bypassing Sharecash got to be a whole category of itself, and people started scamming and spreading virus through claiming their software could bypass having to fill out a survey.
Sorry, I'm getting a bit away from your initial question here. There are (or at least, didn't used to be) any strict limits on this. It's unlikely your file would ever be reviewed. SC doesn't really care for what content it hosts, so long as it is legal. A tutorial, pretty much of any length, could work. It really comes down to how well you can manage to get it out there. Effort is not in creating great content on SC, it is about advertising it properly.
I have a couple of questions because this sounds good:
First of all, how long is the survey? are we talking a few questions or a full fledged marketing study that only a handful of people will ever complete? Can you decide the length or nature of the survey even if a shorter one pays less?
Most people that do surveys want people form the United States, what happens if all your traffic comes from overseas?
It depends a lot. Could be a fairly short competition sign up, all the way to 10+ pages market research surveys. You'll probably have better luck in attractive offers in large, western countries, particularly the UK and USA - something to consider when you are advertising your download link.
In the worst scenario, there are no offers. Though, it's unlikely you'll get visitors with
no offers, there might only be a few high-effort ones available in their region. What you can expect is that you get paid a whole lot less from people outside the US. Very broadly speaking you'd be looking at revenue (from high to low): USA -> UK -> Canada -> France -> Germany -> Rest of Europe -> Rest of world.
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In general, Sharecash is great if you manage to get leads. They pay very generously. If you are willing to place some effort for a higher profit, I would suggest getting a content locker directly from a CPA network. Keep in mind that would add the potential cost of setting up a website, but if you get enough traffic that can easily be earned back with the increased revenue percentages. The thing is when you use Sharecash, they naturally take a cut from the earnings the surveys (offers) users do. Going directly with those who provide SC with the surveys can make you ultimately receive a higher percentage. I can elaborate on this if anybody is interested, but I suggest checking out AdWorkMedia. I've worked with them before and they're great.