unfortunately, I doubt it, and it's not because it's a bad idea or anything
it's just that you have to consider that we're talking about Graal, a community of some of the most anti-competitive people on the internet
it'd just give people something else to cry about, something for them to point at and shout, "BOOSTER! I'M MAD BECAUSE MY NUMBERS AREN'T THAT HIGH"

people would quickly see W/L ratios such as

and **** would hit the fan

maybe we could put a system in place to limit guilds from being too good or winning too much, I bet the www.graalians.com forum community would be all over that
then we could have streak records for the most consecutive losses and maybe even a library where we commemorate the sparrers who gave it their best effort but never quite made it

then some random can come along and proclaim that guild sparring is dead because they no longer enjoy it or can't keep up with the competition and win like they used to
snoreeeee