Since I am not using this method any more I thought I would share it here because I've learned so much and thought I should give something back.
The reason I worked a bit with Fiverr originally because it presented me with a way to sell products to a market of buyers for $0. Now my method may or may not be super unique and it's definitely not complicated and you could easily take it to the next level i.e. get the persons email address and up sell them.
One problem however is getting the first sale at all. While it can be seen as a good place to sell things, the biggest problem is "How can you differentiate your gig from the rest?"
The way I did this was I offered another gig 100% free when they purchased one of my gigs. Mind you the gigs I offered were simple plr ebooks so each gig took me about 30seconds to complete.
This created some initial buzz for my gig and I got a few sales.
What I then did was probably what got me more sales.
I then told the customer that I would give them another of my gigs for free if they gave me a positive review. Generally I would usually complete the original transaction within 24hours so they were generally happy to give positive feedback whether or not they thought the original gig was any good.
I then attributed the constant success of my gigs to having 30+ or so positive reviews on each gig which allowed my gigs to rank well under there keywords in the "rating" column.
So simply I would suggest
1. Sell PLR Content or the likes
2. Offer an initial free gig
3. Offer another free gig in return for positive feedback
(and you could capture their email and try and upsell them in the process)
Hope this helped to those of you who sell or are considering selling on fiverr.