This is my way too, I tried to give my best in my job and to grow on my field and profession ,and after work I focus on bitcoin, and when there's some time left. I don't think there's a need to make stop our job ,we just need to do extra effort and time management.
Bitcoin can be a source of income, just by using free time, that's enough. Without the need to sacrifice work, we can still generate revenue from bitcoin.
If you are a beginner in this industry, you must do bitcoin as your part time income/job. Because you will just feel the real profit here if your ranking Full member and up, but member and below rank it is only a low wages that you can get for awhile. But still at least you earn weekly in the signature campaign.
There are different ways in earning bitcoin as for your information. You are limiting yourself to signature campaign where the bitcoin you earned there is inadequate for your daily expenses especially is someone depends on you.
https://bitcointalk.org/index.php?topic=1777912.msg17735848#msg17735848 a list of all possible ways in earning bitcoin is listed there.
As for my opinion on the subject matter, focusing on bitcoin as the major source of income is not too good. It is still safe to have a regular job and treat bitcoin earning as a source of extra income. As we all know that bitcoin is very unstable and unpredictable. Relying only on bitcoin is not a very wise thing to do.