If your subscribers are fake it's not surprising that you aren't earning much.
Where did you get that idea from?
Honestly OP that many subscribers is pretty low to make a decent income with adsense. I'd advise using your channel to build a list somehow and them market products to that email list.
I'm just saying. It's probably fake since if those subscribers are real i don't see how you can't get at least $100 in a month or two.
Subscribers don't necessarily = views though.
YT pays on average $1 per 1000 views. So the OP would have to get around 3000 views per day. Pretty difficult with only 7500 subs. Especially with YT updates making it harder for subscribers to see videos from channels they are subscribed to.
Out of interest OP, have you tried putting your channel username into socialblade.com? This will tell you your daily average views across all your videos.
YT pays on average $1 per 1000 views.