Assuming that story is true, I'd say his actions are a pretty strong indication that the government's rationale for keeping Pollard in prison is based on some extraordinary circumstances.
Bill Clinton supposedly promised the Israeli government that he would issue a clemency order for Pollard before he left office. The fact that someone as unprincipled and emotionally stunted as that moron felt a need to keep him behind bars is a very telling sign, too.
Or it could mean that he didn't get any kind of payoff, or not near the payoff, that he was looking for. After all, unprincipled applies to a lot of things - sheer greed is as much a part of it as not caring about your nation's security.