To be honest, this is more like running an outsourcing business than freelancing. There is nothing wrong with that. However, it ideally requires a completely different kind of business strategy. (And ideally a completely separate brand identity.)
I have outsourced work on Fiverr due to being overbooked. However, even in the best cases, I have had to revise work. This is not due to a lack of competency on the side of fellow sellers. When writing, I simply have my own voice. Also, I have my own SEO best practices concerning the basic structure and layout of articles. A great writer can return something to me but 9 times out of 10 I will have to edit things the way I like.
In theory, I could create a template and concise instructions for sellers to follow. The problem is, most competent freelancers would charge more to work as per my instructions. In this case, I’d forfeit any potential profits.
As a rule, I only outsource when I have something silly like 12-hours to get something done and I realize I can’t meet a given deadline. I then contact sellers I know, ask if I can pay for expedited service, and edit what I get back later.
If I was to build a business around outsourcing, I would set up a website, drive traffic to it via a PPC campaign, and take things from there.
Lastly, I hate working with other Fiverr sellers who outsource work as part of their SOP. Several times now, I have had fellow sellers place an order. After delivery, they have then started deluging me with orders. It’s like a lightbulb pings in their brain and they think: "All I need to do now is send all my orders to this guy."
This doesn’t work. I have my own clients and workflow and I find it very rude on a personal level. Of course, asking a seller how many orders per week or month they can handle can mitigate this problem. There is a danger, though, in growing reliant on even groups of freelancers when outsourcing Fiverr orders directly. They may go on vacation etc and leave you having to start taking chances on sellers whom you haven’t worked with previously.
There are basically too many quality control variables to take into account outsourcing your orders to someone else as part of your SOP. Worse, all those variables can lead to your clients leaving poor reviews if they are not happy.
Outsourcing once or twice? Fine. Anything else and you need to have a rock-solid strategy in place to mitigate potential problems.