there's obviously a transnational/opportunist component on the Tom side of the relationship, but even with that it's clear he loves her more than she loves him, and its not just *all* opportunism that she's a Roy.

Whatever Shiv does feel for Tom, it pretty much mirrors the way Logan loves his children. Kick him around, let him need you, ease up a bit, give him just enough so he doesn't up and bounce... etc...