I had checked into it initially when I was setting things up, but eventually decided to do it all myself. So far so good.
But doing it yourself also takes time. The first several months did not generate a lot of advertising interest, people were just getting used to things. But over time, then more interest was generated. Probably the biggest issue that you have, is either you do it yourself or go with like CJ or someone. Not sure that you can easily do it both ways, as it would seem to me that trying to do it both ways would really hurt your chances with any advertisers that you try to recruit individually.