i've just suicided myself playing UB, but i think it's impossible to time that correctly and deny them xp and gold..it's a matter of luck in my opinion..
This. I've been going ooze a lot and sometimes I get suicides. Given how much gold is involved for a kill, this is kind of bad design. The other player can do most of the work, but because of some random luck in auto attack timing, he gets no gold for his trouble. It should at the very least give assist gold to the guy who was hitting you. The opponent took a risk in trying to kill you, for him to succeed and then not get any because of bad luck in the timing of his attacks is just stupid.
I wonder if the ooze deactivate thing hasn't been happening to me, or has resulted in me turning it back on when I want it off and getting suicides. They should just fix it so you can't turn it back on if you're below that health rather than screwing around with the suicided system to give kill/assist gold to the opponents who made it happen.