Some gamers do. Like most humans they are attracted to bright, flashy patterns of colors. (most animals actually are). But most mature gamers I know, would rather put some money in better equipment, than flashy colors. So, gamers are as different as the rest of us. Some are caught by the hype, some are not. You see it in cars too. Some like bling, som focus on the actual car.
Me? I like RGB in my keyboards backlight. I don't like it to flash, but I like to make it an orange/reddish color, because that's easy on the eyes, when using your computer at evenings or nights. That's about it.