Personally, I have been matched betting about three years now. Started off in the UK market then moved across to Australia.
At the moment the Australian market is extremely profitable compared to anywhere else, in terms of signups and reloads.
The profits obviously vary from user to user, but most report a few grand from signups. Thereafter its up to how much work you put in to make the most off of reloads. Check out our blog page, we have one user who writes a post each week explaining how much he made and exactly how!