But really, if you see that people claim kills worth 10-20 million or even more in one post you'll notice that it can make you a lot of money. Though a trader will ALWAYS be making more money, if you focus on that. Even without powertrade-running the best routes on a 5k transport. But if you like KILLING, and enjoy fighting, go for it. Even for a decent pilot it will pay for your repaircosts.
The only downside: You need to be at least a decent fighter / bomber pilot, so you can destroy your targets. Getting killed makes you miss 4h of great fun and money. But I guess you know the risks etc.
Blanket bounties really do the trick. Single targets are always difficult or not really worth. If you stumble upon them, it's a nice bonus though.