It's not difficult to understand why Arum is delaying Lopez-Gamboa as much as possible. As long as HBO is willing to give each fighter headliner status (even BAD), that's just more money for Bob and more chances for him to fill undercards with his prospects. That said, unless Arum puts Gamboa in with R. Marquez or de Leon or ANYBODY that general fans might have heard of, there isn't much chance that Gamboa-Lopez is going to be any more lucrative than it would be right now. The sad fact is that they are both little guys and there aren't any superstars in the division to raise either guy's visibility any higher than they are right now. Serious boxing fans know who they are and that's about all that ever will know them UNLESS THEY FIGHT AND HAVE A BARRERA-MORALES or VASQUEZ-MARQUEZ type of trilogy.
If these guys were in their early 20s it would be one thing, but they're not. In all probability, both are at their peak physically and very soon will be on the downside - AND EVERYONE INVOLVED KNOWS IT. Both fighters know it. Arum knows it. And HBO knows it.
Gamboa has been my favorite fighter for a while now, but the truth is that I really don't have any interest in seeing him fight again until he has a real opponent in front of him - John, Marquez, or de Leon would all work. But I don't see Arum risking a Gamboa loss any time soon as it would crush his leverage with HBO.
At some point HBO has to take the blame for this.