mine are 2 Sega blast city if that makes a difference. I could see what you mean if lets say my neo geo 6 slot
It doesn't make a difference, you're confusing the big metal cage that includes the power supply among other things, with the power supply itself.
Your monitor runs directly on AC power from the wall, In a Blast City those wires just happen to be routed through the big metal cage with your power supply in it. the only reason Sega did that is so they could stick a fuse on there.
It still doesn't change the fact that the monitor wont put a draw on your power supply and thus you'll still need a load resistor to keep your power supply from eating itself if you're using that Konami link board.