i've bought--
- book covers for kindle
- youtube views/comments
- facebook friends/likes
- twitter followers
- sultry female voice to read 30 second voiceover script
- custom php programing (small jobs)
- website banner/logo
- silly gag gift for a friend (prank phone call)
- a black man to take a picture of his hand holding a slip of paper saying 'oldtimer" (so i'll be ready for that callout)
j/k on that last one
when picking providers, i look at their reviews and/or check their demo reel
haven't sold anything on fiverr so can't speak to that side of things

if i was going to be a provider, i'd try to fill the interview/review niche
i have a good command presence
but can't really compete with Bulgaria or the Philippines in terms of profit margin