How is it useless if the player quitting loses points? He would have no reason to RQ if it is still counted as a loss.
So you get nothing for putting your all into a fight.....? I'll have you know that not all ragequitters do so to save points, some ragequitters just want to deny you a win, so they will take a loss in points...... It could be that they beat you in a previous match or round and they thought it was going to be a walk in the park, taunting and all...only to get wrecked in the next 2 games out of 3, some can't handle that and would feel embarassed.
....Just an example, but people quit for many reasons. Some bison player once told me he don't play against grapplers, you'd be surprised at the reasons people quit, like a really low tier character like gief double perfecting a nash online who has more points and is in a higher rank......Here's the thing, If capcom punishes rage-quitting hard, like -200 LP and give the winner what he was suppose to receive, maybe 65-100LP, then that will cut out ragequitting entirely for whatever silly purpose the player deems he will pull the plug. There will no wry smile on the quitter's face thinking he prevented you from getting the points you won fairly, in that scenario the ragequitter loses any which way.