If I'm going to submit a pull request to the marketplace and I see that this is the sort of thing on offer, I become skeptical that a skilled person who can deliver solidly readable code on-time is going to spend their time on this site. That means it is probably not worth the work it takes to package up a task for a total novice. If I don't have many of these sort of easily-packagable tasks, then I'd just do them myself. If I do, then it makes a lot more sense for me to go and hire a junior engineer who can actually learn my app/data model/domain and be 6x as efficient tackling them as a random person who doesn't have an ongoing relationship with me.
Companies often lose money hiring interns who have a whole summer to ramp up, but make up for it in the recruiting benefits. Why would they hire an intern for 4 hours.
1) This is a two-sided market problem. In order for a two-sided market to succeed, you need to jump-start it with either a bunch of chickens or a bunch of eggs. See http://www.joelonsoftware.com/articles/fog0000000054.html
2) It takes time and effort for someone to package up a task such that a total novice to the project can pick it up and work on it.
Are you affiliated with the site? You're on a new account and it just kind of.. feels like it. The reason I am asking is that if this is the case - why don't you just email the people who signed up and ask them.