I mean "you get nothing" in the most literal sense. That crystal spend does not get you anything.
It just lets you spend energy on the same thing again, but that energy also could have done any number of other useful things. I would much sooner advise advancing, say, Baze and Nihilus in parallel and either using those crystals for more energy or saving them for chokepoint gear shipments than to advance Baze faster. There are so many good single hard node characters that you can definitely find a good goal to redirect that energy for.