I officially started with adsense last year. At first i was just too random. By "too random", I mean, I didn't have plans, and I just did things randomly, and didn't have expectations. But now I think I am more organized with adsense.
Iv been with adsense for over a few years im finally going to get paid soon from them, iv got about $94 about a few more weeks and i should get to $100 for payment :d only recently i started using it properly.
Is enough? Why would you want to limit your potential to grow? Wouldn't you like to get a couple hundred a day? I don't see why you wouldn't want to keep at it.
Oh. Well then you are doing really well! Congrats. Do you have a website that is already established and is getting a lot of traffic?