Problem with bounty hunting is that it doesn't scale well.
In early game when you fly Eagle, Viper or Cobra the payout is decent.
However, when you get into Asp, Clipper and Dropship the operational costs for fuel, ammo, upgraded and repairs becomes far too high. Repairing hull from 80% to full cost 35.000 on Asp, and 260.000 on Clipper. A rated upgrades on Asp is 5 million. B rated for Clipper is 5 million, and 16 for A rate.
With that level of repair expenses and upgrade costs you simply make too little from bounties, even if they pay out 10-40.000 per kill.
Someone suggested doing Interdictions from Supercruise. This is NOT doable in Asp, Clipper and larger ships because succesful interdiction makes your ship (for some stupid reason) take hull damage, and with the heavy repair cost for these ships you end up with more expenses in repair costs than you earn from bounties.
Trading scales up from the simple fact that you get larger cargohold. From 40 tons on Cobra to 96 on type6 and 216 on type7 (provided you keep shield gen). That means your profit margin from trading more than doubles each time you upgrade to next ship.
Bounty hunting prizes all remain the same'ish nomatter what ship you are in, so there is no scaling. Also, on another note, the bulletin board missions also, largely, remain the same regardless of your rank, reputation or ship size.
I am a Lord of the Empire, with allied reputation and flying an Imperial Clipper... I have 164 tons of available cargospace as well as heavy Class 3 and Class 2 weapons. Yet the bulletin boards keep offering me low pay missions like transporting 3 tonnes of Biowaste for 1600 credits (which by the way doesnt even cover fuel costs). Very rarely does a mission to transport silver, gold or palladium show up (and those, by the you get Clipper, pay adequately). By and large all the bulletin board mission offers are the same whether you are in Sidewinder or Clipper.
This makes it very, very slow to upgrade and play Clipper and large ships. Doesnt help that 50% of all stations in the entire game are also unavailable to you in those larger ships due to no pads at outposts. E.g. I cant help Empire in Durius system with my clipper due to there only being outposts in entire system.
The chance to find higher value bounty targets, as well as higher payout bulletin board missions need to seriously be increased to make it remotely interesting to fly larger ships.
Personally, I have stepped down into my Viper again.
It is almost like Frontier doesn't want us to fly larger ships...