@kingpin4321 has made some points and redirected you to a couple of threads. Unfortunately, the provided links are incorrect:

Ranks -> Merit & new rank requirements
Bounties -> https://bitcointalk.org/index.php?board=238.0
In addition, rules -> Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQ


Regardless, the forum should not deem a job for anyone unless you are developing something or involved in trade or services. Bounties and signatures can be a source of lateral income, more so in some countries than others, but considering this to be a job is rather demeaning of one's personal capabilities.

Besides, the forum and campaign signatures could be around for an undetermined amount of time (a year, a lustrum, a decade .. who knows), so tying your income to whatever you can scratch from campaigns and signatures is rather uncertain. Most of the spam comes from lower ranks who see this as a job (with exceptions obviously), and accounts that perform spam sooner or later get into trouble and likely banned if reported.