Look for copywriting
I've been a member for around four years, but only upgraded to
'pro' recently. After I upgraded, work started to roll
That said, I was not persistent when I was a free member.
However, as a free member, your bids are very limited. Pro members get way more per month. In my
opinion it's well worth the money to upgrade if you're willing to check the site regulary and place bids. (And there is a time
comitment to set up your profile.)
Don't pay for the upgrade if you're not willing to follow through.
More will be added as available.