I don't necessarily like treading into these threads that often, but my take on it is similar to Aeana's. Yes, there are certainly some girls who probably put it out there that they are female because they want the attention for Twitch money or YT money, but at the same time, there are females out there who just don't want to promote the illusion that "there are no girls on the Internet", "girls don't play video games", "girls only play Facebook/mobile games", "girls don't know any better and they get suckered into buying crappy shit", etc. At the same time, it can be kind of awkward whenever guys overreact positively and negatively when they find out a female is into video games, regardless of genre.
Last year, I started streaming more often because I had purchased a capture card. There were at least two streams where I used a microphone. One of which was archived (which is no longer archived because of what happened), and one of which wasn't. I don't know what happened, exactly. It must have been during AGDQ or something else, but someone ended up sending me harassing messages like this one:
...because they probably discovered that I am female because of one of the streams where I used a microphone. I don't make it an issue to make my gender public, even though I used to take the time to correct gender in posts back when I first posted on GAF. I ended up sending a copy of the message to Twitch support and tried to file a complaint, but nothing was really done. I have to admit that my feelings were pretty hurt (yeah, even after a dumb short message like that), and after that, I never used a mic on my channel again. I don't even openly link to my channel anymore and only stream for people I know and trust.
I end up getting messages like this on PSN because lord knows why (probably because my PSN avatar is of a female character). I actually think this kind of stuff is hilarious.
I've even gotten some friend requests on Miiverse because I am female with some accompanying messages that can make me feel a little uncomfortable (ie: u wanna wii u chat????), especially since I am more than likely older than the sender or they simply want to use the messaging service as essentially a pick-up service. It sucks. I'm genuinely stating my gender and putting my Mii on my Wii U because I don't think it's a bad thing to do; it's who I am. I'm not doing it for attention at all.
So while you can say that some women are using their gender as a means for attention, that isn't necessarily true. Some women just really want to state who they are and that's that. It just sucks when some of us get harassed online for it.