I believe that’s an image issue that already comes with the name of this plattform.
I remember reading about a store that sold cheap shoes, the ads were targeted towards an audience that was interested in cheap shoes. Then they changed the whole design of the store and put ridiculously high price tags on the cheap shoes and reopened the store.
They noticed that a lot more wealthy looking buyers came to the store at the day of reopening and bought the ridiculously overpriced shoes. When asked how they experienced the whole situation, most of the shoppers said they felt like the price was warranted because of the exceptional quality of the (actually cheaply made) shoes.
On fiverr, a cheap service is associated with cheap quality, which is why they tried / are still trying to encourage sellers to offer higher prices to change the image of the site alltogether, but a fiver( r ) is a fiver in the end.