While I am on the fence about it, and certainly anticipated a UC: Exploration is nearly risk free, even more so with a carrier nearby. This low-risk is offset by having extreme losses when it does go wrong. If you can sell all your data whenever you want, there is almost no risk of something going wrong and no real consequences when it does go wrong. Not sure about that from a balance perspective: low-risk-low-consequences isn't the usual target.
Not saying I am against adding a UC, but I am not sure it is as straight-forward a choice. Ideally I would like to see some kind of explorer income, but without being able to sell all data. For example, only allow certain types of data to be sold. That way you can keep your upkeep going for as long as you want, while also still suffering a potential risk if things do go south.