If OP wants to earn from the forum, then bitcointalk.org is not the right place. If a person consider bitcointalk.org as a source of income, then I dont expect that this person can bring something valuable to the forum and will be just a parasite, flooding everywhere with useless posts.
Yeah, never think this way, you can't consider Bitcointalk is a source of income. Let's find a decent job that has a stable source of income.
Earning something isn't bad, but don't rely on the forum's earning, this was created because of sharing an idea and thought regarding cryptocurrencies issues and blockchain technology stuff. And also be constructively poster than and be useful in the forum then, everything is fine, looking signature that you want to promote is easy for you.