Don't worry what others are making. There's really no direct comparison to what your situation is. There are people making less than you and most likely people making a lot more. The best you can do is optimize your site to get the most out of the traffic you have and to attempt to increase the right kind of traffic directed at your site. Do those two things and you'll be a winner.
maybe even breathing is, check their TOS for details I dont use adsense anymore, but get like $2/day from old sites
i've been building niche sites and steadily growing i'm close to average of $20/day now, and hosting is just minimal at dreamhost.