Is it a good idea to use Fiverr for a big project?

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For example, lets say your an internet marketer and you want to outsource the development of a digital product to then sell. Rather than using one freelance client to build the whole product, do you think it's a good idea to break the product up into many different individual tasks and use Fiverr.

Would it be cheaper in the end?
Would it be faster?
Would the product be as good as using a single client?

I'm aiming these questions at people who have experience using Fiverr, or even another similar system such as Amazon Turk. I'm trying to determine if crowd sourcing is a good idea for product development.