The only way you're going to make any real money on Fiverr, without working yourself into the ground, is by ensuring that you only post gigs which can be cut/copy templated. By that, I simply mean you need to think of the time it will take to complete your gig verses how much you think your time is worth and design a gig that can be easily replicated for multiple buyers.
I've made around $700 from Fiverr in the last 3 months. I've managed this by setting up specific gigs that literally require me to 'cut and paste' my finished product in order to send it across. I originally started off full of enthusiasm, like the OP, writing articles and doing BMD blasts for people but, before long, those who wanted 40+ hours of work for $5 started to stream in and ruin the day.
My advice is this: think of something you can offer that people want, ensure that you can deliver that service in, say under 5 minutes - this includes creation and delivery - and finally, be really specific in your descriptions and don't be afraid to be a little abrupt. Some buyers are so thick they need to be told things bluntly. You may worry that saying things like, 'I can't guarantee your [product feature] so please, don't order if this is a problem for you,' may scare off potential customers, however, in my experience it only scares off the pests who were only going to give you headaches anyway. It's Fiverr - be realistic about what you're prepared to offer and leave no grey area for annoying buyers to try and exploit.
On another note - I've always found their support staff to be very prompt, very polite but when it comes to solving user issues, they're border-line helpless - the 'report spam' block button works better than they do.