Insurance is not much of an issue nor a reason. 5mil you can get back in about 10-15 minutes, providing you have a trading ship big enough (Type 9 would do) and you don't get blown up again during those 15 minutes.
You can get 2 mil in a Hi RES in just 30 mins. NPC FDLs and Condas pay about 200K a piece. What have you been doing?
Nghhh.... just because its possible to grind big money back doesn't mean I (or others) want to. For me, its not even about limited playtime. My wife already gives me enough dagger eyes for the amount of time i spend playing this game. Its just I do what I want to do when i want to do it, and the focus of that is not credits but enjoying myself.
For a start, i don't trade. Last time I traded, it was in Open for a CG. Shielded Type-9. Was pulled out of SC and destroyed within seconds. Not even time to charge the old FSD. Funny thing was, i'd already been pirated by Code earlier in the day and it was a good experience. We had a chit chat, they made their demands, i dropped some goods and was on my way. Not this guy. No comms, just started blasting at me with rails as soon as we dropped out (yes, I submitted - can't fight interdictions anyway in a Type 9). Shields were gone in 2 seconds, my hull was gone in another 5. Not even time for a high wake out.
Guess what, I relogged in Mobius and I think that was the very last time i played in Open. Its experiences like that that simply for me make playing in Open not worth it.
Rebuy plus loss of cargo was over 5 million... well, great.
With over 800 hours of play my total assets are currently around 200 million. And yet i see people get that within a week of play. Sorry, not my playstyle.
So, what do I do for money? Well, let's see.
Exploration: 500k-1 million / hour. Depending on what i'm doing. Hard to get above a million per hour, and that's with first discovery bonuses, unless get very lucky or go farming neutron stars (which i never did, i got Elite in Exploration without doing that).
Mining: Highly variable, like to use a Python, can get between 500k - 1.5 million / hour depending on luck and availability of mining missions when return. But i don't mode switch to generate new missions. If there are some, ill take them, otherwise i just sell.
RES BH: Vulture or FdL - Not done much in Haz RES, i might be able to get around 2 million / hour in Haz RES. 1 million/hour in High RES is do-able, no guarantee though, a bit of bad luck, lack of attention, and I might have to take an early trip back to the station.
CZ: 500k - 1 million - Vulture or FdL. Rarely get above 1 million/hour unless the CZ is spawning lots of big ships.
NPC Piracy: 500k/hour - FdL. Its slow, you have to find targets, getting cargo is a slow business.
Missions: 100k - Asp. 1 million - highly variable. Sometimes I just take my time doing missions and take low paying ones that give good reputation.
Bimbling about: 0k/hour. Sometimes I just wander from place to place, or go for a drive in my SRV. Profits are low to non-existant. Maybe i'll pick up some Tea from a few planetary installations.
PvPers seem to assume that as soon as someone dies they should immediately go grind trading or HazRES BH to recover their losses, and that people want to focus to get their millions as fast as possible. To those people, i say poo to you.
I want to enjoy the game, not to have a second job.