i dont think that bad players who ragequit care about ranked points.
i also ragequit sometimes, when for example i loose on a shitty connections against a raiden or kunglao or whoever can take advantage of delay, who arent good but win nonetheless, and they do a fatality.
it might seem lame, but just for the record, if i know im beat fair and square i will sit trough fatality or bablity or even teabagging but if i lose against a player who i know dont diserve to win i will deffenatly leave and dont give a fuck.