Bounty, in terms of language meanings, is a kind of bonus. Therefore, it is obviously that bounties themselves are not main source of income. It is fine if you consider bounties as additional income only. Then, you can use such additional income from bounties for entertainment, travel, or other kinds of things to increase your quality of life. Considering bounties as main income is risky and might put you under pressures if the forum shut down by admin, or admin decide to disable all kind of bounties posted and run in the forum, for example