Getting subscription fee it requires real effort and very high quality content. If you don't mind may I know in which domain you are working. I have been working in language learning for last one year and have got quite active subscriber base but I don't know If they would make payment.
There is a saying that " Never Put all your eggs in one basket". So the people who know this will never depend on adsense completely. One can earn a lot from Adsense but one can also loose everything in adsense. So, be careful.
I have been living well on adsense for some months now and it gets better everyday. I am now branching into cpa since i dont want to put my head into one basket
I started off with adsense thinking that I would make a living out of it and it is not also very difficult. BUT, the thing is that you don't have any control over the adsense people. They can ban you anytime. Someone has said it very right, DONT LAY ALL YOUR EGGS IN ONE BASKET... give a deep thought to it.
If you are good at it and you can see money potential in Adsense, why wouldn't you do only with Adsense? I saw many people who are good at Adsense, for example, but they suck big time in other money making ways like affiliate programs etc... The most important is, you must see if that what you are doing now with Adsense sites is profitable for you. If it is, keep with that and in some time you will have enough sites and enough income to quit your daily job and devote completely to Adsense... When you achieve steady income with Adsense you can try to move some of your eggs to other baskets...
I don't completely agree with this because a lot of people reach the topend and just cannot move forward without a huge investment.
Currently my Adsense earnings would not even cover my hosting fees. It's hard to make a living off of it.
I live on 3 things. 1. Job as a php programmer in a company 2. Adsense 3. Selling ad places on my sites I keep my job always as my backup and I try to make my sites better in my spare time. Keeping backup is must in this volatile world.
I would say you should have alternative blogs and always creating new ones that way if you can even your odds of generating money and one of those blogs becoming viral and hey if 2 sites are making $1.00 a day imagine if you had 100 of those and you can do the math of multiplying
I'm already working with adsense, And also generated more then $99 in a single day. But currently I'm also doing my job, So I only spend few hours on adsense.