As you know from peeking at my channel, I certainly know the time sink that animation is. I started out doing cgi, dabbled in Flash, back to cgi, then, one day realized I simply wasn't happy staring at a screen for 8-16 hours a day and that I wanted to physically touch my artwork....which was the start of my stop motion.
Without knowing your channel or seeing your work, I'm stuck making assumptions- the first would be that your animations are relatively short (1-2 minutes)? If that's the case, and even more so depending on your retention, certain, higher paying ads aren't even offered.
Another unfortunate setback for animators is that YouTube prioritizes channels based on how often they upload. A channel who uploads daily or even weekly will be ranked far higher and promoted more than one who updates only sporadically.
It's unfortunate, but, for that reason, they definitely favor game channels who can put out a 10-30 minute video daily over an animation channel who only uploads a short every few months.
I've seen this plenty (and confirmed with my YouTube advisor) on my own channel- as soon as I stop posting, all of my video counts plummet quickly.
The last negative for animators are the actual advertisers and that animators, unlike game or review channels, don't have a specific target product market.
It may seem counterintuitive, but broadcasting to a wide market and demographic is a hindrance, not a positive. Gaming channels (I hate going back to them so much, but they're the easiest example) will have game, computer, game systems, peripherals, and so on advertising on their videos...in addition to the broad market film trailers and whatnot that we will get.