I want share my experience with about buyers.
Fiverr is platform only for buyers.
You can not do any thing if buyer buy your gig without any confirmation of job he wanted.
And its necessary for sellers to do what he want to do.
But its very very bad for sellers.
If seller cancel the job its not good for sellers.
If buyer cancel the job its again bad for sellers.
If you refund or buyer ask refund its bad again for sellers.
If you file a dispute or disputed again and again job will be late then again for sellers loss.
yesterday on buyer buy gig and in 5 dollars and i see the requirements in DOC files of 50 dollars package.
I will also tell about end of my job once i see all people comments and suggestions.