Just so they have something to fall under if ever bitcoin does a nosedrive.
We've moved from 3500 to 13000 in a matter of months, if it were to be ones only source of income, you must be driven into FUD and panic sales, and would miss out gaining big returns.
Newbies/bounty hunters need to learn this
Regardless if they're more vulnerable to FUD or not, having bounties to be your only source of income is still not a good position to be in. You'd pretty much need to trust that these two things will be fine in the long term:
1. bitcoin's price: if it does a nosedive for whatever reason and they're still holding most on bitcoin or cryptocurrencies, then you're screwed.
2. Bitcointalk: if Bitcointalk closes for some whatever reason, then you're screwed.
Having bounties as a income is great. But it shouldn't be their sole income.