Why to make it free ? You should make it paid, to stop fuel of so-called $10 clients comes here. I mean paid for coders. With low fee per project (under 5%) but with $xx/month fee to use site. This will bring serious service providers, but still affordable. Take a look on Elance, biggest, most successfull site and for everyone including coders unlike in that RAC, GAF, SL - those sites are for monkeys without any serious money (they make happy only owners, and full of cheap unskilled coders as well as full of crap clients)
if you speak a foreign language or if you can hire someone that does you could expand your site to countries that need the the most. 1. you could hire someone that speaks a foreign language through DP 2. you could use minor paid survey websites to find out which foreign countries have the most potential