I will state for the third time that I did not intend this mode idea for internet server use, but rather as a fun way to combat friends, not total strangers, within ESF without dying too quickly.
Using this mode as a basis for tournament matches would also be a good idea which I hadn't considered before.
And if 50X is too much, as Sonic Booster said, what is to discount 3X? 5X? 10X? etc.
Another idea would be to put a slider or option for the server itself to decide on the starting hp and ki amounts, so everyone would have a personalised mode and could set the values to the settings they prefer for friendly matches, tournaments, and internet play...
Although I do realise that this sort of thing would require more time consuming coding, and so I still stick to my idea of a fixed realistic fight mode with a set X amount for hp and ki.