Financial well being and security is largely irrelevant to a predatory paedophile - it doesn't matter how much they have in the bank, if they have sexual feelings towards minors then they will inevitably seek out situations where they can act upon those impulses - in fact their fame and reputation as celebrities is often the the very thing that allows them access to children in the first place, as we saw with Savile before him.
And then that position of trust makes it harder for their victims to come forward and be believed - even on this website, folk were reluctant to entertain the idea that nice, friendly Rolf could be an abuser, as people are often taken in by the public facade of respectability.
I doubt Harris has any concept of the impact his vile behaviour has had upon his victims, in fact it's more likely that he will see himself as the victim here - this lack of empathy and self-pity is a recurring feature in paedophiles who are brought to justice.
As to his estimated £12 million fortune, I would be amazed if his victims ever see a penny of it, but then closure to them will be seeing him brought out of Wandsworth in a body bag rather than any compensation claim.