[What would you do with $1000 in Fiverr Bucks?]

Oh marketing and sales, 100%. Not that I need more clients but I need to develop less time intensive products and services that clients will still benefit from and market the hell out of it. 

[Is the Fiverr "Promoted gig" option is helpful to get more orders?]

I tried it for a few months last year and didn't seem to move the needle much. That said, play around with different gigs, they may perform better than others.