You're insinuating that there aren't any girls at the challenger level. You're digging your own hole in your argument right there. Just because YOU aren't at that level, doesn't mean there aren't any girls there.
If girls were as good as boys at this game
How dumb of an If, then statement. Again, female diamond/challenger players, yet since girls aren't as good as boys, then there shouldn't be any boys at the bronze, silver, gold, plat levels, right? Wrong.
Now, to a more important question. Where are you getting this statistical reference of 1/10 pro and female players? I simply said "Girls don't play on pro teams because boys don't let/want them." Doesn't matter how many female players are professional level, it's simply put. 4 guys aren't going to want to put up with a females drama in their shared household. A group of 5 guys can easily stay together than 4 guys and 1 girl, and that's for many reasons. In Quake 3, there were a few ALL GIRL pro teams, and those girls were a lot better than some of the guys that played Quake 3, see Girls of Destruction, a group my sister was invited to join, but didn't because of her young age at the time.
I apologize, but I simply can't get over your horrid statistics. There are 150 professional (recognized in the LCS and not including any backups or coaches) players, You're assuming out of the 27 million people that play League, 2.7 million of them are females, and 15 of them should be professional? Where are you pulling this information from? And here I was trying to defend female LoL players, or maybe just you, from the harsh criticism you're receiving. Never again. Shame on you interwebs!